I am a fan of any working stuff.
I dislike it, if there are problems with voice in game, as it is at the moment in Arma2.
Mumble can help this out, If the VON is not getting better in huge steps, there are only a few ways to solve the comms-problems we suffer in game.
I dont want to open discussion about any other programm, but TS has low quality, ventrilo cant handle the "up" and "down" channels, and so on and so on.
We use muble already since a few, and thats a ROGER on this on...