I'm waiting for AM2, then I'll see prices and if they're too high I'll do 939.
I'm currently on an Athlon XP Mobile/AGP system. I figure AM2 would be a nice upgrade path, and since any upgrade right now would require replacing almost everything, I might as well replace everything and have a bit longer upgrade path. Plus, large capacity DDR2 is less problematic than DDR and cheaper. (The FX-60, in multithreaded apps, offers about twice the performance of an Athlon XP 3200+, so it seems like a good upgrade too)
That, and I'll need an upgrade eventually. I figure the X800XT I just bought it about the dead end of AGP for performance, so I'll need to go pci-express sometime. That, and an Athlon XP 3200+ is getting a bit slow to be called high end gaming, it just barely breaks the 60fps average barrier on most games now, and will dip significantly lower under heavy conditions. (hate seeing RTS games chug from having too many units on screen...)
Oh, if socket 1207 or whatever the new opteron socket is seems to be coming out within 6 months to a year after AM2 (either to desktop or cheap server chips), maybe I'll wait for that, integrated pci express sounds tempting.