I guess that the best approach for multiplayer games, is to build the game around an IRC server/client architecture. One thing I was wondering about, is to do something around bittorrent as it may grant an option to build a serverless multiplayer game. Also have to be aware that any multiplayer game will suffer from lag (it's not a secret), no matter how well you code your network layer or the protocol/transport you use. Anyway you may timestamp your packets or set some way to tell priorities or number of packets before any action happens. Just my opinion.