Pie Guy is a fun game for your iPhone that is free, is installed via the Web (it is a fancy Web page), works offline, and is actually a lot of fun (works sorta like Pac-Man).
"If you find Pie Guy a fun game to play, well thatâ€™s grand.
But, I hope Pie Guy will also be an opportunity for the code-savvy among you to learn a trick or two about making serious web apps for the iPhone. Just grab my source code and tweak it. Iâ€™m not talking about just a fancied-up webpage here; this is a fullscreen game, with fast gameplay and responsive touch controls. I canâ€™t wait to see what a better programmer does with this stuff (itâ€™s not hard to program better than me!)"
A very notable thing to do and I hope a ton of talented developers take him up on it. I'd love to see stuff like jQuery for iPhone games/apps (which I'm sure exists in some form or another).
Also of note: As Neven pointed out in his announcement post - don't try this on your first generation iPhones. This game only performs well on an iPhone 3GS.