Apple has added some good iPhone development resources to their site, including a great guide to Optimizing Web Applications and Content for iPhone.
It includes recommendations on style sheets, interface interactions, form sizing and layouts, supported media types, and a lot more.
They also list "unsupported" technologies (like Flash) and other functions and features you should not use, many of which I indicated in Is Your Site Design Ready For The Future?
As an example, Safari for iPhone does not support:
window.showModalDialog()- Mouse-over events
- Hover styles
- Tool tips
- Java applets
- Plug-in installation
- Custom x.509 certificates
They even have sample code. All in all it's definitely worth checking out.
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