I think it will be a useful feature to be able to get special links for annotations on pages we annotate. For example www.diigo.com/aaaa#bb may open the annotated page and take the scrollbar onto that specific annotation. When every annotation has this html hash specific to themselves, it will be easy to produce these urls. There may be a menu item in the annotation menu, "get link for this annotation".

I think toolbars bring more usability, and every web site like Diigo and WebNotes have also bookmarklet equivalents (may not have all of the functionality, but useful). There is some part of the functionality I have told it should be on Diigo, like lists, tags, and other annotations and you can configure the toolbar for extra filters, but I think this functionality should be more complete if it has the things I mentioned. PDF support and annotation will be great too.

Could you provide a feature lets people to categorize/tag (not interfering with the other "real" bookmarks of them) bookmarks (generally single pages which we mark as unread)? I think this feature will be so useful for both individuals or groups making "long lasting research" on the web for something (like finding developer tools, themes for sth, papers or articles about sth, etc.), but don't want these bookmarks interfere with the other "real bookmarks" which are collected for later remembering, later searching, general use or note taking. This categorizing can be both private and public (so should be made within groups). For example I or my team make a research about a topic, but we don't want to "save"/bookmark pages as our daily bookmarks, but collect them and read them later. We can use this feature, applying some tags (so categorizing), probably and very likely save these as "unread", but we don't see these bookmarks in our own (unread and normal) bookmarks, only in a special tag/category/group.

Yes exactly 2 types of bookmarking. I think this will be useful for everyone, because everyone surfing on the net collects some useful sites, articles, resources for a specific aim (not general bookmarking & use), for example I, myself, collect wordpress skins, research articles about school topics (for this we have some groups with my friends and I think bookmarks in these interfere with others in my own bookmarks).

So there should be "bookmark spaces", it can be implemented as group specific, topic specific or
tag specific, etc.

Thank you for your response. Happy diigoings...