I'm waiting for a year to a year and a half. Got enough DDR ram in my system, got an X2 processor, got one of the better S939 mainboards out there, so I just can't justify the switch.
I agree for people building a new system from scratch that AM2 is the way to go, but I'm already hearing preliminary reports (from Damage at the Tech Report, among others) that the nForce5xx chipset runs incredibly hot for a chipset (active cooling required), a little concern for me. The new ATI chipset doesn't have this problem (doesn't need more than passive cooling), but only has 4 native SATA ports as opposed to the 6 of the nForce 570SLI and 590SLI chipsets, and also doesn't have integrated gig Ethernet. I think they'll do well in the OEM market, but someone will have to add additional engineering to make a true enthusiast-level ATI board.
Intel Q9450 @3.2GHz, Gigabyte GA EP45-UD3P, 4 x 2GB G.Skill @4-4-4-12
Antec P160SW case (modded), Xigmatek 750w PSU
3x 500GB (RAID-5), , OptiArc 7200S, ASUS E818A3T
Creative X-Fi XtremeGamer, Hauppauge HVR-1800, Radeon 4890