Saw a nice article on Tomshardware about it and it seemed appropriate to post it here. Here's the article itself: http://www.tomsguide.com/us/RaidCall-IR … 16102.html

"This social client merges IRC-like channels with Skype-like VoIP communication, creating a unique hybrid that may be valuable to gamers.

Its biggest selling point? The ability to handle 20,000 simultaneous callers – with no loss in audio – without the need to rent or host a server."

Not entirely sure what the latencies would be but it sounds pretty good, worth a look.

Homepage: http://www.raidcall.com