Share books you are reading on social sites such as Facebook or Twitter, or on your own blog or webpage/landing page.
Keep a list of everything you read in a year
Use Lists and list notes to organize books and articles for class work or group projects
Make lists of things you want to read or purchase
Write reviews and share them with your friends - get a conversation started about the books and articles that speak to you (or don't)
Incorporate reading lists into Course Management Systems
Save resources you find when you are at a public computer in a list; when you are back at your own computer you can easily then add them to a reference management program like Zotero or EndNote...
and so much more...
11/18/2013 Update: Important: The WSU Libraries migrated from WSU WorldCat/WorldCat Local to Search It/Primo in mid-December 2013. Griffin and WSU WorldCat links will no longer work, and if you have a WSU WorldCat account you will still be able to see your saved items if you log in to Open WorldCat (www.worldcat.org), but saved lists and saved searches in WSU Worldcat did not transfer to Search It (although Search It has something similar: see the EShelf). You can still see and search WSU WorldCat, but you'll see it is not fully functional - click here. Summit is still functional; you can find it here.