The iPhone and iPod Touch devices allow a user to save a WebClip bookmark to a site on their Home Screen.
To specify a bookmark icon for all pages of a web site, place a PNG image named "apple-touch-icon.png" in the root directory of your web site - similar to the "favicon.ico" for site icons.
To override the site bookmark icon on a specific web page, insert a <link> element similar to <link rel="apple-touch-icon" href="/customIcon.png"/> within the <head> element of the page.
The bookmark icon dimensions should be 57x57 pixels. If the icon is a different size it will be scaled and cropped to fit.
Safari will automatically composite the icon with the standard "glassy" overlay so it looks like a built-in iPhone or iPod application.