Windows 7 is ok, but certainly not a "killer" OS that has anything particularly compelling about it. If you're in the Windows camp, you'll like it - probably as much or more than XP, almost certainly more than Vista. If you're in the OS/X camp, you won't miss it. If you're in the Linux camp, you'll just make fun of it.
I'm one of those practical/pragmatic people. I routinely run Linux 'cause that's what I like and find easy/useful. Family members run a mix of OS/X and XP. I have a dual-boot partition set up to run Windows 7 (alongside the latest Ubuntu). Ironically, the only reason I boot Windows 7 is to run iTunes to load up my iPod Touch. ;-)
You wear suspenders too?