How do I specify an icon for a bookmark on Springboard when a user adds it to their home screen? I added a favicon, but that doesn't seem to work.
All the information about this is available here.
Add the icon file with the name touch-icon-iphone.png to the root of your server, then add this tag to the head section of your web page:
<link rel="apple-touch-icon" href="touch-icon-iphone.png" />
For more information about the resolution and sizes check the above link (I don't want to copy/page a whole page of documentation here).