A 2 week, 10,000+ lines coding done by Apple to demonstrate the graphics and audio capabilities of the iPhone for gaming.
YouTube: iPhone SDK Demo - Touch Fighter
The link may only be for Tech Talk attendees or ADC Member but if it works for you, enjoy.
Here is the link to download.
https://connect.apple.com/cgi-bin/WebObjects/MemberSite.woa/wa/getSoftware?fileID=24200
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