Zotero

I recently started using Zotero which to me is useful for managing citations, bookmarks and notes. I like the fact that you can combine books, articles, blog posts, webpages, newspaper articles, etc. all in one list with the ability to add standalone notes that you then put into folders as well as tagging. It's a little like mixing delicious and RefWorks. I also like that it, too, appears in the lower corner of my web browser, so it is always available. Andrew mentioned it in a comment, too, so he would be a reference if you want to know more.

The Zotero Quick Start Guide is a place to go for more info and a brief video.

Switching between Delicious and Diigo

You can actually import bookmarks from one service into another one. Go to this link: http://www.diigo.com/import_all/prepare?service=Delicious

I also found these instructions if you want to use both (Diigo’s “Save to delicious” feature (found under Tools once you login) allows you to simultaneously add your new bookmarks to delicious.).

Go to the Diigo site for more information on using Diigo on Smartphones and Ipads as well as Diigo for Education where you can create class accounts: http://www.diigo.com/education.

Delicious also has apps for iPhones and Ipads to track your bookmarks. Both can also be added as gadgets in iGoogle.

Lots of options out there.