Hi Mike,
Did you ever get this resolved?? I'm having the same problem. I have a late 2009 Mac Book Pro running 10.6.8 OSX and VM Fusion 3.0.2
I had Windows XP set up on this machine and never had a problem detecting a second monitor at work or the one at home. I recently upgraded to Windows 7 and ever since I can't get it to recognize the second monitor.
Any help would be much appreciated!!