I think tilt-scrolling would be quite unusable, albeit a nice optional feature - would be nice to play with it to see if it really works. There is definitely a problem with scrolling on the iPhone when it comes to long pages - making scrolling to the bottom of a page pracically impossible in some scenarios. There is this bias towards scrolling to the top, but not the bottom embedded into iPhone's design. That's why I made the End Of Page app for Safari on the iPhone - it lets you scroll to the bottom of very long pages without having to flick forever. It is free - I am releasing it in the hope that others find it useful. I should be on the App Store on Friday, provided all goes well with the approval process.