Interesting discussion. An iPad has recently also arrived at my kitchen sink. And it immediately occurred to me that my jQuery app, build around a lot of drag'n'drop, would encounter some difficulties on that platform. How is a touch-aware jQuery UI gonna help me in that situation? I think that, realistically, the iPad will require a totally different code base/user experience.
On this subject, I expect many of you are customers of Amazon? Have you experienced what happens when you marry Apple's iPad to Amazon's One-Click shopping experience? Fasten seat-belts. The only way I can avoid inadvertently ordering stacks of books whilst merely browsing the Amazon store with my iPad is by consciously signing out of Amazon after each transactions. Unreal... :-)))