Link > HOWTO: Create native-looking iPhone/iPad applications from HTML, CSS and JavaScript

Nice article on iPhone web apps – a little dated already, but still has some good info.

HOWTO: Create native-looking iPhone/iPad applications from HTML, CSS and JavaScript

Mobile web design issues

Great article on iPhone 4 screen size issues and designing for it Designing for iPhone 4′s Retina Display:
http://globalmoxie.com/blog/designing-for-iphone4-retina-display.shtml

also see:
Targeting the iPhone 4 Retina Display with CSS3 Media Queries