One of the reason I have not played a role playing game in years is because of the logistics of it all. Finding mature individuals worth gaming with is one problem, and actually finding the time to set aside several hours to do so is another. Fortunately, just as the games and game companies are moving onto the web, so is the actual playing of games.
Many folks out there are playing RPGs online through e-mail or on web-based discussion forums. PBEM.Com is the best resource for getted started in playing RPGs over the Internet. They typically have over 500 announcements of games looking for players as well as extensive material on how to get started in e-gaming from both a player and a game master perspective.