For an online, multiplayer roleplaying game that should be able to support at least 1000 players per server instance, what sort of architecture should I use? I'd like to use Java or PHP as the server programming language (I know PHP is probably a poor choice). What sort of operating system, and server specs would I need for such a system?
Their architecture described:
Since you're already doing Java, you might want to take a look at Sun's DarkStar project:
I don't know any commercial games using it (I believe it's still in development).