Game engines using XNA as their base have started popping up. Do a search over at Gamedev...there's at least two of them. There's also some Nintendo Wii support emerging, too. I saw an announcement for Wii support for some engine the other day, although I can't recall the one. IMHO, a Wii port of 3DGS would make sense given the inexpensive, more indie friendly costs associated with the behind-the-scenes crap. 360 I'm guessing would be a simpler port, but it's my understanding that kits are much more expensive.

http://www.gamedev.net/