My buddy Todd got me started in this game called 'Fallen Sword'. It's an MMORPG of sorts. It's text based, no downloads required or anything and really easy to play. Heck, I played at lunch and leveled up to level 3 pretty easily. You get some pretty lame quests at first (kill rats for example) but now I'm up to killing goblins ... which looks to be a big deal.
Anyway, it's not a graphically awesome game, but it's fun. Sign up, play a bit and have some fun.