I blogged about online entertainment several months ago and talked a bit about music, TV and online games. The thing is, there is so much more you can do with free online services! If you are looking for a great time sink, check out a few of these options.
Stumbleupon.com - Set up a profile using your email address and let Stumbleupon know your interests. You will then be routed to websites that match your interests. Just like on Pandora, you can tell Stumbleupon if you like or dislike the sites they take you to so they can better match you next time!