Does your website suppot Apple iPhone?
iPhone Dev Center explains how easy it is to create a WebClip Bookmark Icon for iPhone users.
To specify a bookmark icon for all pages of a web site, place a PNG
image named “apple-touch-icon.png” at the root directory of your web
server – similar to the “favicon.ico” for site icons.
To verride 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.