Om,
Thanks for mentioning Diigo here.
If we can help, we really do not like to get too lumped up with other bookmarking services like delicious though I think the thing that differentiates Diigo’s social annotation from social bookmarking services is that highlights, comments and interactions happen right on the page, in situ. Personally, I think this makes Diigo not only a more useful personal tool, but also a more powerful social tool that enable more fruitful interactions and connections among information consumers.
See Flash demo (http://www.diigo.com/help/tutorial.htm) and Why Diigo?http://www.diigo.com/help/why_diigo.jsp
Diigo includes bookmarking features as a necessary component, since without it, it would be difficult to track things. Plus, Diigo allows advanced search of full-text pages, tags, notes, highlights, and titles.
Wade Ren, CEO
Diigo (www.diigo.com)
Wade Ren on December 27th, 2005