It occurs to me that a few people on the board have PS3's. How does their online matchmaking work? Do you have a gamertag? Code? Does it change from game to game? Just asking because I thought it may be worth adding this information to the list.
It's a unified tag. For example, mine is 'blindrocket' and if you had a PS3 you could click on "Add friend" and then type my name. I would then show up in your friends list and you could invite me to all of your online games, send messages, pictures, video chat, etc.