I just found out that Apple have a page on their site dedicated to technical drawings of their ‘iProduct’ range, including the iPhone 4. It’s for accessory makers, but would also be handy for creating 3D models, if you like that kind of thing. Which I do.
There’s a goldmine of resources I didn’t realise they had here, including hardware icons and Mac logo, as well as tons of developer stuff, which is really the point of the site.