Risk is totally sweet. I've been playing the online version for the past few months with friends from all over. I think the link was originally posted in Tilted Nonsense, but here is the new site address for anyone interested in playing online:
http://216.199.69.100/war/World at War
It's free. It's easy. And the site is all about the game. Over 20 different maps to choose from, including the classic map, different card options and turn options. Play with your friends or meet new people by joining their games. Real fun.
Now all I need is someone to do the same thing for Axis & Allies...