Of my personal circle of 7 friends, 8 including me (as that seems to be the direction this topic as headed, amazingly without any flaming):
All 8 of us have DSes
7 have Wiis, including me. The other 6 bought them after playing mine. The last one will be buying one when he doesn't have to camp for it (It's hard to find one in Indianapolis still). Till then he mooches off our Wiis >_<
3 have 360s. I'll be getting one soon myself I hope (expecting a price drop this year and a relief of RRoD issues)
3 have PSPs (again this includes myself)
0 have PS3s. Although none of us have them. Me, and 2 others would like them. We all agree that we won't be picking them up though till they hit $350 or less, $400 if something comes along that we can't wait for.
Edit: Interestingly we all owned PS2s last gen, only 3 of us owned GCs (including me) and 4 of us owned Xboxes (the same 4 who owned Xboxes bought 360s, minus me who can't afford one yet and doesn't like RRoD). The reason I think this is interesting is that we almost directly reflected the market sales.
Oh and, if anyone was curious, we are 20-25 year old male college students. Most of us have girlfriends, but none of them are gamers (i can still get mine to play the Wii though :D)