Well, as far as the computer distribution goes, we have one Mac user (non-Intel), one Linux user and the rest (7 people) use Windows.
However, basically no-one would ever consider paying for something like VTT, even when DI is included. I've tried getting people interested in other (cross-platform) software like it (way before VTT was annouced) and no-one was the least interested. We all like to get to together in real life - the "being social"-part of our gaming sessions is as important as the actual gaming.
Those of us that crave some form of "virtual gaming" all play World of Warcraft (Of nine people, 4 currently play and another 3 have played before) or Neverwinter Nights (1 person).
Cheers,
Meadred
Edit: Spelling