Social bookmarking/online class library

Who needs textbooks when you have the web?
Check out this FREE service:
http://del.icio.us/
here's my personal list, http://del.icio.us/dryggirl , but...
as you find great web resources for students, like Mike mentioned in the previous post, start building your class CYBRARY!
You can create assignments from the documents you find and have your students post classwork in thier online portfolios/blogs/wiki's etc.