My office job means I sit infront of a computer for 8 hours a day and have a lot of downtime. Also, most websites/forums are blocked.
Same...except I have no blocks
I go to local newspaper sites and argue with people on their comments. I go to fark.com (guessing that's prob blocked for you) and spend lots of time there. Cracked.com. Gizmodo, Gawker, etc.
On the old caleague.com forums I was a much bigger forum whore than here, my forum whoring days have dwindled a lot, but I still post in a lot of threads on these forums due to down time at work.