New announcement from the Apple Developer Connection this morning (not the SDK yet):

Introducing the iPhone Dev Center
Resources and tools for developing web apps

Log in now
http://developer.apple.com/iphone/devcenter

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Complete with technical documentation, sample code, and videos through ADC on iTunes, the iPhone Dev Center is your single source for information on designing, coding and optimizing web applications for iPhone and iPod touch.

iPhone Reference Library
Access documentation, guides, and release notes on developing web applications and content for iPhone.

Phone Tech Talk Videos
Hear from iPhone experts on interface design and processes in optimizing web applications and content.

Web Development Guidelines
Get the latest development techniques on mobile browser-based user experience design and development.

Safari Compatibility
Download Safari 3 Public Beta and design your web application to create the optimal iPhone user experience.

Sample Code
Learn techniques for interactive and standards-based design on iPhone.

Web App Submission
Once your app is ready, submit it for possible listing in the Apple web apps library.