Are you a Linux user who (secretly, maybe?) wants to try Windows 7 alongside your Linux desktop? The Loku's Domain blog details how to fit Win7 into your GRUB boot menu. Your own installation might/hopefully be simpler than having to manually edit your boot menu from a live CD, as one commenter suggests, but Loku's post details the fail-safe method of getting everything back to normal once Windows decides to take over your system's boot-up process. And it should work for any copy of Windows 7, either the officially key-licensed (once it arrives) or the one you found lying on the sidewalk of the internet.