John Inman said:
Yes, you can delete the windows partition and restore the space for OS X. It is a simple process using Boot Camp.
You don't need Boot Camp for installing Vista. Vista is EFI enabled and will boot from the DVD. Vista needs at least 2 gigs of ram for smooth operation. I have installed the 32 bit version RC 1 on my 3 GHz Mac Pro w/stock GeForce 7300 video card. It performed satisfactory. But it is totally useless at this point since most of my windows apps are not compatible.
wrong, you need bootcamp to install vista, unless vista is the ONLY operating system you are installing. you need bootcamp to partition the harddrive. OS X won't partition a portion of a harddrive without wipping the entire harddrive first, so if you want to keep what you have on there, you use bootcamp. (unless you are using mac pro, but that's not what the OP is doing, he's using imac, where there is only ONE internal harddrive.)
and the best way to store partition (given you made it with bootcamp) is using bootcamp
there are plenty step by step guide, look around in the Windows on mac forum
