It's too bad there is not a class at the Freshman or Sophomore level that introduces students to social media tools. I think they would find it to be useful throughout their college careers. For example, Delicious, Google Reader, Google docs, PB Wiki, Google Groups, and Google Blogs would seem to be particularly helpful to both undergraduate and graduate college students. In fact, an entire course could be devoted to Google alone.

Delicious and Google Reader

Delicious and Google Reader are cool tools! They help you to keep dozens or even hundreds of online sources organized. They also allow you to share them with your friends. I would think graduate students who write a lot of papers would find them to be particularly helpful.