In the NYC Learning Network projects, we've been doing a lot recently with using a webapp on an iPhone (here's our first stab at a search engine using Eric Sanderson's brilliant Mannahatta data). There's all kinds of ways to do this (we're most excited by PhoneGap). For me, as a Ubuntu Linux user, this is pretty great--I can help develop large pieces of the application without dealing with Apple and its locked-down way of doing things. There's just one problem--I really need to see how it works with WebKit, the engine behind Safari and other browsers.