I like reading a few of the "famous people" tweets (like Brent Spiner, scalzi, Keven Spacey) who actually use Twitter for something besides "Go see my new show!", and I could see using it for family maybe, but other than that, it's not very fun for me.
Even if you Follow people, most of the time you end up with pages and pages of half-conversations on your list, and what fun is that to read? But I had to at least try Twitter. heh
Forums or IRC for me, thanks.