Slackware all the way!
I use it to connect to good 'ol AOL (dial-up) haha...play games with WINE, and run all sorts of applications...
Words wonders for programming, but sucks when I go to school and have to reformat it for Windbloze
Then again, for the stuff I am too lazy to get working on it, I still use XP as the second OS...but I LOVE the speed of linux...so nice, and it has not crashed *once* in 1 1/2 years