HP reported today they're releasing a similar device soon that runs as Windows 7.
The ipad runs... iphone OS...
Apple will still sell a ton because some people buy mac only, and it's great they're first with it.. But a fully functional slate type PC that runs Windows7 and isn't crippled is going to be way better.
HP Slate:
http://news.cnet.com/8301-17938_105-20001804-1.html