Fun and games related:
Classicgames.com
Online games on chess, checkers, bridge, gin, blackjacks and etc

gameshows.com
play and compete with other netters

at Uproar.com
"Your online game network"

at aol.com
The applet arcade

2am.com
play war games and simcity online here!

Tetrad.Stanford.edu
Wargame opponent finder

Roguemarket.com
Trade with virtual dollar


Medievia.com
Play Mud game

Cs.okstate.edu
FAQ on Mud game