I have a Windows 7 tablet here at work and it's pretty dang sweet lol. Not quite as portable as the iPad though. And I do like the apps on the iPad and Android tablets being made specifically (well I guess not android) for them.I don't think we'll see a tablet that truly rivals the iPad in the same price range until HP releases a WebOS tablet.
edit: sorry, the part about "price range" didn't register until after I hit submit. The tablet here at work cost like 1800$