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Other Stuff: del.icio.us is so barebones that there's not much else it offers. Google Notebook's advantages are all outlined above but are held to some degree by Diigo, though Google does hold out the possibility of superior future integration with its other products. In contrast, Diigo's additional features abound. You can include a linkroll of Diigo bookmarks on your blog/website that includes your comments on webpages when people click on the links from your linkroll. Diigo also updates del.icio.us with all of the bookmarks added to Diigo, so you do not lose any of the benefits of the del.icio.us community. In addition, Diigo can automatically post to your blog based on the sites you've bookmarked and commented on. Winner: Diigo

Annotation - Content Highlighting and Notes The key feature of Diigo is annotation. Users can bookmark a page and highlight text and images on the page to take note of. Highlights on a page by the user will then save and appear as a blue dashed underline whenever they visit the site again. Hovering over a highlight will bring up a menu where the user can optionally add a note to the highlight and make the note private or public. Highlighted text with notes attached to them will appear as a solid underline in blue. Also, if you browse to a site that other Diigo users have highlighted or added notes to, you will see their highlights on the page (if saved publicly) colored in orange. Being able to bookmark and annotate a page is very helpful. In terms of research, you can bookmark and annotate all the sites related to the topic you are researching. When your done getting all the information you need, select all the bookmarks in the “My Bookmarks” area and select in the top right drop down, “Extract highlights.” This will then grab all your notes from all the sources you’ve saved and display them on a clean page for you to look over and print. This is a great tool for bloggers as well. Gather up all your sources for a post your working on, add your notes, and when ready, select all the bookmarks and blog about it using Diigo’s built in blogging tool (explained below). Blogging I personally prefer blogging straight through my WordPress installation, but for those of you that want to take notes, gather sources, and easily publish a post to your blog, Diigo may be your solution. Diigo allows you to add multiple blogs to your account, verify them, and easily publish a post, however you may only publish and cannot manage old entries. What I like is that while you browse the web and you come across a site talking about a specific topic you want to expand on, you can right click and select, “Blog This,” which will then direct you to the blogging area where you can write your post along with that site being your source. The other method is by simply going to your bookmarks section and selecting a bookmark, or multiple bookmarks, that you want to write about and then selecting the “Blog This” option from the top right drop down menu. All the sources, highlighted text, and notes will be included in the post document, which you can easily remove if needed, ready for you to write. It’s not an entire blogging platform, just a simple publishing tool that works. Browser Toolbar and Bookmarklet The Diigo toolbar, available for Firefox, IE, and Flock, brings most of Diigo’s features right to your browser. The toolbar allows you to easily bookmark websites, highlight and note pages, search documents for keywords, search terms in a page using your favorite search engine, and it even brings all bookmarks right to the toolbar. The toolbar also is what makes it possible for you to see highlighted text and notes that you and other users have made on websites you visit. Bookmarking a site is as simple as clicking the Diigo button and filling in the tags and highlighting just involves you highlighting the text you want to save. One of my favorite features is the “QuickD” button (not in the above screenshot) that I recently came across. The QuickD button allows you to save a bookmark to Diigo with one click without needing the original Diigo popup to appear and adds a default tag to it (you may also fill in tags in the search box of the toolbar to tag it) so you can just click and go. What if you don’t want to install an extension to your browser? That’s fine because Diigo also provides it’s user with Diigolet, a browser bookmarklet that allows you to easily bookmark and annotate any website as well as view annotations on pages left by other Diigo users.

This annotation feature is particularly powerful when used in conjunction with Diigo’s social features. Diigo allows you to create groups which can be public, private or semi-private, allowing you to collaborate on research through the use of links and annotation. Diigo also allows you to attach notes and comments that are visible only to the group, which is an extremely useful feature when sharing the link both publicly, as well as in a group context.

In addition to collaboration, Diigo’s social side is excellent for content discovery. The service can provide recommended bookmarks from other members based off of the links you have saved in the past, as well as recommending other users whose bookmarking habits seem to match yours. Diigo takes the “social” in social bookmarking very seriously, and provides very effective tools for finding friends on the service, as well as finding new people who have interests similar to your own. Friending another user doesn’t mean just making them a contact, it enables you to generate buddy lists, allowing you to organize sharing of bookmarks with friends, as well as providing a messaging system. Whereas in many other bookmarking services the sharing and social features seem to occur more as a byproduct of the sharing process, Diigo puts those social networking features front and center. However, Diigo’s interface is very content focused as well, making it clear that this isn’t a social network as much as it is a social tool.

The Diigolet is a surprisingly powerful bookmarklet, revealing sticky notes and annotations, as well as providing all the basic functionality a user needs. However, even with my hatred of adding additional rows to my browser window, the Diigo toolbar has won me over and become my tool of choice to interact with the service. Both tools will provide tag suggestions and assist with group functions, as well as the ability to send the link via email, however the toolbar goes even further. When using the toolbar, you also have the option of cross-posting your links to other bookmarking services, or even Twitter if you require. You can save simultaneously to Diigo, Delicious, Magnolia and Simpy, as well as to your own browser’s local bookmarks. Bookmarking to other services seems to work well, and saving to local bookmarks is a particularly awesome experience when using one of the latest betas of Firefox, which will attempt to auto-complete based on both history and bookmarks. It even correctly applies tags in the Firefox Places storage system, which is great but makes me wonder why the toolbar bothers to also build a hierarchal folder system inside Firefox as well, as the tags do that job already.

Another powerful feature that the toolbar adds is the Diigo sidebar:

the Diigo sidebar allows me to search and browse both my bookmarks and the bookmarks my friends have posted. In addition it allows me to get current information about the page I am viewing via the “This URL” tab. I can access public bookmarks and annotations, and lists of Diigo users who like the site. Diigo also can provide quick metrics about a site that I am visiting via the main toolbar. Using the “About This URL” menu option will provide a overall popularity score for the site, including a breakdown of the number of links to the site from Diigo, as well as from Google, Delicious, Yahoo myweb, Bloglines, Technorati, and Digg. Diigo also provides a calculation of the site’s Google PageRank, which is a really awesome bonus feature that I just discovered today.

As I have browsed through the user forums, this seems to be a common practice for the people behind Diigo to actively engage with their users for ideas, and respond constructively to critiques.

Diigo is really head and shoulders above the majority of competing social bookmarking services in terms of features, and the site itself is certainly more responsive than my beloved Magnolia, which is a wonderful service in itself, but runs slow as molasses.