iPhone “Add to Home Screen” Callout & Home Screen Icon For Your website.
This tutorial shows how to create a Callout Bubble to Direct Users to add your webpage to their iPhone Home Page.
This tutorial only uses CSS3, APPLE iPhone iOS for Safari, & jQuery. It also creates a 7 day cookie in which the closed callout will stay hidden when users return.
(via Z.A.Martz | Examples | iAdd2Home)