Delicious, the popular social bookmarking site whose future has been in limbo since last December, just relaunched with a new feature they're calling Stacks. Stacks is a new way to display and share your bookmarks with others. Stacks are essentially multimedia previews of links that you have organized according to the tags you assigned to them. The video below provides a nice overview of Delicious Stacks.
Another change to Delicious that you should note is that you can now tag your bookmarks with phrases rather than just one word labels.
Applications for Education
Delicious Stacks could be a good visual way for students to explore a set of links that you have shared with them about a topic. You or your students could create multimedia playlists about a topic to share with each other.
If you're wondering why you should use an online bookmarking service at all, just consider the time and frustration you'll save yourself if your computer ever unexpectedly crashes on you taking all of your most important bookmarks with it. By saving them online, you can always access your favorite bookmarks from any Internet-connected computer.