I had a quick swizz on one in the Apple shop in New York last week. They are great little bits of kit, they really are. Like everything from Apple, they just...work. BUT, would I buy one - no way. Firstly, I hate being ripped off over here. The 16GB in US is $499 as opposed to the £539 GB suggests above. Secondly, I believe that price (certainly the US one) is without 3G! What the frig is the point of that?! It's a portable device but we don't have the public wireless infrastructure yet to support that in any meaningful way. So, you have to buy a 3G one which is more expensive still. Then you have to sign up to a monthly 3G contract at £x pm.
A great product, but a little before it's time imo.