like I said all boards support the technology... It's just a flag in the sBIOS that has to be enabled for SLI to be officially supported... Trust me I know all about it as I was personally there they day the NVIDIA execs made the call -
http://www.legitreviews.com/article/782/1/
Currently Newegg Sells 20 LGA 1366 motherboards and all but 1 support SLI... The one that doesn't support SLI is of course the Intel reference board as Intel would rather die than pay NVIDIA a licensing fee.
ASUS Rampage II Extreme LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
ASUS P6T6 WS Revolution LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
ASUS P6T Deluxe LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
ASUS P6T Deluxe/OC Palm LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
EVGA 132-BL-E758-A1 LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
DFI LP UT X58-T3eH8 LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
GIGABYTE GA-EX58-UD5 LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
GIGABYTE GA-EX58-EXTREME LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
Foxconn Renaissance LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
Foxconn BloodRage LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
BIOSTAR TpowerX58 LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES (the biostar site doesn't list it, but it does)
ECS X58B-A LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
GIGABYTE GA-EX58-UD4P LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
GIGABYTE GA-EX58-DS4 LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
GIGABYTE GA-EX58-UD3R LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
MSI X58 Platinum LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
MSI X58 Eclipse SLI LGA 1366 Intel X58 ATX Intel Motherboard - SLI Support YES
Intel BOXDX58SO LGA 1366 Intel X58 ATX Intel Motherboard -
SLI Support NO