When I moved out of Canada to Korea to start teaching, I found myself in a small town with a couple of other English teachers and no gamers. Discovered online gaming. Later, discovered OpenRPG and now, I do all my gaming over it. I run one game (in my sig) and play in another. In my game, the players are in 3 different countries, in the other game, the players are in 5 different countries and two of them are non-native English speakers. Without the internet, I couldn't game at all. There's simply no one to game with here.
For those who've never seen the attraction of OpenRPG, well, I can say that it is a very different experience than tabletop gaming. However, beggars can't be choosers, and, in some ways, online gaming is even better. Google search images, and you've got a very visual dungeon experience. I suppose I could just use NWN, but, I like the fact that my game IS DnD, not a video game. Sure, I'd love to sit around a table with a bunch of buddies and a cooler full of whatever drink of choice. But, instead, I type in front of my computer screen, a glass of 16 year old single malt scotch in hand (gift from a student - gotta love tourists) and play.
So, yeah, the internet has drastically changed the way I game.