Shoutbox

I know you can definitely shrink a hard-drive like that

I have Vista installed on an old machine at work at shrank the hard-drive into two partitions to test the Win7 beta on it....and successfully reversed it again.

One thing to note is that it'll replace the bootloader, so you'll have to rebuild the Vista bootloader if you ever do decide to get rid of Win7.......but I'd echo the sentiments above.....Vista is just Win7 done very badly, scrap it off and use the whole hard-drive for Win7