Olympia Play-by-Email - In my opinion, the best email game out there, certainly the best I've run across.
Lord Foul's Home Page - Lord Foul is a great guy who is also a player in the Olympia PBEM. Any new players should feel safe in asking his assistance.
Blizzard Entertainment's homepage - These guys make the best computer games out there in my opinion. If you do not yet own Starcraft/Broodwars, you don't know what you're missing. Soon I'll start up my Starcraft page with screen shots of Glipster kickin' some booty. Don't forget to pick up the Warcraft series.