With Igoogle you can personalize your start page. That's the main goal of this site. What's the secret of iGoogle? Gadgets. There you can find a good variety of those (also called movable windows). Some of them are games, others show you the time and the climate, and so on. Another site like this one is Myaol.com. If you want to know more about iGoogle, look the following article:
http://hubpages.com/hub/www_igoogle_com