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Digital document annotation on an iPad

1. Google Notebook is very much similar to Diigo Lists. In Diigo Lists, you can organize, share and display specific collections of bookmarks. Once you add bookmarks to your list, you can easily re-arrange the collections by drag-and-drop, and add "section". And you can publish a Diigo list as an HTML document. 2. In Diigo, an item in a list is also saved separately as a bookmark (which can be tagged). So in this sense, Diigo integrates both Google Notebook and Google Bookmark. 3. Diigo also has the important advantage that "clippings" are really "highlights" on the original web pages and will be shown as such when you re-visit the web pages, reminding you the exact context of the clippings. 4. Another unique Diigo list feature: once you create a list, click the " WebSlides" button, you can browse, play and annotate any list of URLs as a slide show! It's great for content browsing, sharing, and creating unique presentations based on web content.Here is an example of a Diigo List, consisting of recent reviews of Diigo, and watch the Diigo List / WebSlides in action! 5. Google Notebook is a bit more flexible in that an item does not have to be tied to a webpage. Diigo Lists will soon be upgraded to provide this flexibility and a lot more in the near future.

Not sure that this compares to Diigo's functionality except that you can upload docs

Backboard automates the process of getting feedback and approval on all your projects-it can handle almost any type of file, but it's especially good with mixed graphical and text media. It only takes a minute to start a Backboard. Upload the file you would like feedback on, choose a security level, and select the email addresses of one or more reviewers. Each reviewer will receive a link to your file, where they can come and leave feedback on your document. Every kind of document can be annotated and marked up in the same way, so reviewers do not have to learn several commenting systems. Better yet, you can view all reviewers' feedback in the same place, so you'll never again find yourself merging several documents with different "tracked changes." via http://larryferlazzo.edublogs.org/2008/12/18/best-applications-for-annotating-websites/

I still think Diigo is a far superior social bookmarking and annotating service.

Capture entire web pages with just one click. Save products, travel itineraries, news or videos and easily find your content back later on

A.nnotate.com lets you easily give, collect and store detailed notes on documents and web pages.

Like Slidecast, but with video. Not sure if I like to comment bubbles yet.