My biggest problem with both the iPhone and now the iPad is how you're locked away from free software. At least, I think you are; I've never owned either device, so I can't say with certainty.

I likes my Firefox, my OpenOffice, my GIMP. Frankly, I'm more confident about the tools I download from SourceForge than I am of many commercial applications.

The i-stuff is interesting, and I have a creeping feeling they're going to have a huge impact, but they're not for me.