This is really hilarious. As soon as I saw them say that it wasn't going to be released until the Fall for the iPad, I knew people were going to start whining. Apple just can't win with some people. First they squeal about lack of multitasking and then when they come out with it they squeal about when they are going to get it.
If you really want something to squeal about, check out the iPhone 4.0 page on Apple's site:
http://www.apple.com/iphone/preview-iphone-os/
Check out the bottom where it talks about multitasking compatibility. Notice any device missing from the list?

I'm sure it's just an oversight, but one more thing to worry about.