The 1.1.3 software update for Apple iPhone and iPod Touch includes a provision for specifying a special icon that will be displayed on your home screen when you bookmark a web page using ‘Add to Home Screen’.

The image must be a standard PNG file 57 x 57 pixels in size.

To create the link to the icon use the following markup:

<link rel="apple-touch-icon" type="image/png" href="http://www.example.com/touch-icon.png" />