I found out that 64Mb is required to run Aero in Vista and in Win7. But the Upgrade Advisor was only seeing 32 MB on my GPU even though the GeForce Go 7200 is 128 MB. But, I forgot that a portion of the 128 MB is shared. So that makes sense.
It seems like it will work fine in Win7.
And speaking of the Windows 7 Upgrade Advisor, I was using the beta version when I received that incompatibility message about Aero. I found out that the final version of the Upgrade Advisor was released today. When I downloaded it and ran it, there was no longer the incompatibility message about Aero. So perhaps they fixed its dumbness!
I'm looking forward to Win7, and I will keep this thread updated if I find out anything quirky when I do the...