Links that get used rather frequently when I' m utterly bored (or, more often, trying to avoid the fact that I have a ton of homework due):
http://www.ocremix.org - where I just came from. Awesome source of music and a great community, too.
http://www.vgmix.com - more great music, similar community, albeit newer and less developed.
http://www.amiright.com - song parodies up the wazoo. Mostly mediocre ones but an occasional gem. I' m neminem there too, by the way... too bad for the no spamming your web site rule, or I' d' ve sneakily made that link a link to my own parody list ;-).
http://home.att.net/~miller.daniel.r/index.htm - a web comic I found a few weeks ago. Nowhere near as good as the long-dead BBoCS, but in my opinion the best one out there at the moment. Assuming HSR doesn' t count as a web comic. Which brings me to
http://www.homestarrunner.com - I don' t think I need to say anything more.
http://www.neopets.com - stupid, but insanely helpful if you' re looking to waste time.
Then of course, there are books. If you like sci-fi or fantasy, PM me and I' ll give you several dozen of my favorites.
On the other hand, if you' re looking for more semi-permanent ways to use up time... I don' t have any, because I don' t have any time. Seriously. I don' t know about
your college, but the college
I' m a frosh at, you' re insanely lucky if you only have two hours of homework in a day. Ah... memories of high school... I didn' t think I had a ton of free time, but I really did. Um, independent study? Like, learn to program or something? Or if all else fails, you could actually try to get a girlfriend. Not that that' s worked for me so far.