I don't know if any of you have tried out this VOIP solution. It's called Mumble/Murmur. It is a very light weight package, has a very small foot print, and sounds excellent.
I have been running the murmur server for several weeks and it is excellent.
i7 930 @ 4.2Ghz
GIGABYTE x58 UD7
Kingston HyperX T1 Series 12GB
GIGABYTE 7970 (1280/1800)
OCZ Vertex 2 100GB SSD & VelociRaptor 300GB