Social+bookmarking

Social bookmarking is a way to have and share your bookmarks in one online location.
Check out the common craft video: Social Bookmarking in Plain English which refers to Delicious web site. Delicious resources & guides.

Diigo is a more powerful option - allows collaboration, sticky notes, and has a variety of educational groups. Diigo is constantly improving their site. Diigo help has the most current information.