I just want to use this to show off a really good site that can be both interesting and a bit of a timewaste, but a fun one nevertheless.
Basically, you sign up, then it will ask you to list your various interests, like, for example, I have:
So, then, when you've set up your account with your interests, you should download the toolbar (I use Firefox, so I dunno if it works with anything else, but I imagine so haha). Then you'll get a toolbar like
Though, if you're needing to do any work or anything, it can make the hours disappear SO quickly, haha.