There's a really interesting article on The Register that kicks off by explaining how the iPhone's Safari browser supports Ajax, so will be Web 2.0-friendly, before moving on to suggest that Nokia could also give mobile Ajax a boost in the next year.
I'd been sitting here thinking Apple was missing a trick by making the iPhone such a closed ecosystem in terms of allowing developers to create applications for the handset (well, NOT allowing them...). Yet if the browser is powerful enough, they won't need to.
Maybe. Well, it's more food for thought while we wait to actually get our hands on the thing, anyway.