I played EQ for a bit when it was in beta, and then a bit when it first came out. It was fun when it was new, but got boring fast. I tried again when the first expansion came out, but couldn't really get into it.
Now, I might have to check out World of Warcraft when it comes out. They seem to be putting a lot of effort into making a MMORPG that doesn't take most of your time to play... and I really trust Blizzard to make some really fun games.
Threaded Mode