He shoots rainbows from his back.

Mumble[sourceforge.net] is an excellent voice chat client.

I have two Mumble servers. They shouldn't require a password:

Barugon
Address: barugon.mymumble.com
Port: 64967

and

Triton
Address: triton.typefrag.com
Port: 63645

Zombocom[zombo.com]