Right, so here it is:
I used to play some computergames like World of Warcraft (don't stop reading!) and Unreal Tournament. We used several programs to communicate through a microphone. That way, we could talk while using the keyboard to navigate, saving us a lot of time since we didn't have to type in chat.
Now, wouldn't it be great to use those same programs to chat together during games? I know I'd love to hear everyone go OOOOOOOOOH and AAAAAAAAH when something awesome happens.
Imagine "SHEED FOR THREEEEE!" (I know, a long-shot with his abysmal shooting, but bear with me) or whatever cry you might like.
We'd need someone to host a server (or pay for one

) and everyone needs to get a client. They're for free, and there's lots of them out there like Ventrillo, Teamspeak, Mumble, etc.
Right, let's hear them thoughts.