Here’s a collection of iPhone-targeted HTML5 links we stumbled across recently, for whenever it is you decide to get into writing cross-platform or non-AppStore apps:
Nice and easy introduction.
Some handy formatting tips.
From IBM developerWorks, no less; provides a sample inventory management application, tested on an iPhone 3GS and a Palm Pre.
Sprite library using the canvas tag, targeted at retro pixelated games; several playable demos.
Learn HTML5: 10 Must Read Lessons has a bunch of good stuff.