Update - didn't work. I didn't think it would...
At any rate, for giggles I tried running a repair. It detected my Windows installation as D:\Windows. Strange. So I booted to a Fedora 10 installation disc I have and ran rescue mode to get a shell opened. I ran fdisk and looked at the partition layout - to my surprise it was reporting that the "System" partition Windows creates during installation had a problem (something about the sectors not lining up or something).
I deleted both the "System" partition and the regular partition I created from the Windows install, rebooted and booted back to the Windows 7 installation DVD to give the install another try.
Will report results... I really, *really* wish Windows' installation partitioning utility were actually sort of intuitive and told me *something* useful about the drive.