The Responsive Designer
8 Popular online apps to test the mobile version of your site
35 Inspiring Mac Related Websites
Accessibility for iPhone and iPad apps » Matt Legend Gemmell
MAke your iOS apps accessible
ProtoFluid - HTML5 and CSS3 Web App Prototyping
Test your @media queries and web app on various screen sizes
Webkit CSS Properties
Safari for Desktop and iPhone properties listed in a table. A must have.
Hedwig
SproutCore Touch for iPhone and iPad