Now that 65nm AMD Athlon 64 X2 Procrssors are available I'm sure some of you are going to pick them up. Many boards will need a BIOS update for them to work and not all have been updated... Here are a few boards that I know work.
MOTHERBOARDS FOR 65nm X2:
Important Reminder: Update the BIOS with an older 90nm processor BEFORE installing a 65nm CPU
ECS RS485M-M / BIOS Rev. 1.0d, dated 5/24/06
Asus M2NPV-VM / BIOS Rev. 0603, dated 12/05/2006
Asus M2N32-SLI Deluxe / BIOS Rev. 0706, dated 8/21/06 (BIOS 0603 works, but no Cool & Quiet)
DFI LANPARTY UT NF590 SLI-M2R/G Rev. A, dated 8/29/06 (I'm running mine on this)