Delicious is a free social bookmarking tool. Store your bookmarks online, tag them and share them with your colleagues and students. Easy to use to search for other bookmarked resources.
iGoogle lets you create a personalized homepage that contains a Google search box at the top, and your choice of any number of gadgets below. Gadgets come in lots of different forms and provide access to activities and information from all across the web, without ever having to leave your iGoogle page. Here are some things you can do with gadgets:
View your latest Gmail messages
Read headlines from Google News and other top news sources
Check out local events and news
Store bookmarks for quick access to your favorite sites from any computer
Design your own gadget.