I've sold my copy of Windows 7 and intend to stay with WinXP until I can find a decently priced copy of Vista. I have a copy of Just Cause 2 that requires either Vista or Win7 and I really miss playing that game. Even with all its flaws, Vista make actually be a better investment than Windows 7 if I choose to leave WinXP behind.
Irony can be quite ironic. ;-)