I play Kingdom of Loathing. text based RPG with cool stick figures and lots of funny pop culture references. lots of equipment to upgrade and buy, lots of quests to complete, and lots of players willing to help if you get stuck.
http://www.kingdomofloathing.com
I also play a couple of browser based nation building games just to use up the spare time.
www.uranme.net and
www.cybernations.net