The first step is admitting you have a problem...so I'd just like to confess that I've developed an addiction to the firefox plugin on www.stumbleit.com.
For those of you not in the know, stumbleit.com has you fill in your user's interests, then provides you with a time-sucking firefox button, which will randomly pull up pages relating to your interests. Here's one I just came across, for all you mac users:
But the main website you need to check out is:
Seriously. It'll replace your current "web 1.0" internet addiction in a heartbeat.