ASRock is showing off their N7AD-SLI based motherboard at CeBIT running CrossFire. The nForce 740i board is running a modified BIOS to make it work.
The screenshot verifies that the Catalyst drivers are seeing the SLI motherboard as a qualified chipset to enable multi-GPU performance. While there are no numbers, the rig was running 3DMark06 and it did show a performance increase to confirm that everything was working as intended.
ASRock is working on a BIOS for several other motherboards and is hoping to get CrossFire and CrossFireX working on all of its nForce boards.