Design for the iPhone

• hardware constraints
• mobility

Network :

• EDGE (236.8 kbit/s)
• WiFi (11/54)

No flash

From http://www.apple.com/iphone/specs.html

480×320 at 160dpi, 320×360 available in portrait (?)

Portrait and landscape

Fonts: Helvetica (source: Khoi Vinh)

• Finger for pointing
• Virtual keyboard (with automatic spell checking)

User agent:

• Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A538a Safari/419
• Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A542a Safari/419.3

iPhone detection on http://www.apple.com/trailers/

if (navigator.userAgent.match(/iPhone/i)) {
    window.location.replace('/trailers/iphone/');
}

http://www.joehewitt.com/blog/firebug_for_iph.php : firebug for iphone