Apple publishes some iPhone development guidelines:

Developers can create Web 2.0 applications that look and behave just like the applications built into iPhone, and provide seamless integration with iPhone applications and services including making a phone call, sending an email, and displaying a location in Google Maps. Third-party applications created using web standards can extend iPhone’s capabilities without compromising its reliability or security.

You should read the whole thing, but I wanted to extract some important points:

• The iPhone doesn’t support hover or drag and drop (this is a common touch screen device limitation).

• It doesn’t (yet) support Flash.

• You’d rather put your content in columns or blocks for a better experience with the zoom feature, but the available width remains “big” for a mobile device: 980px.

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