Google: One Fish, Two Fish, Red Fish, Blue Fish:

You may have noticed that Google has a new favicon, the small icon you see in your browser next to the URL or in your bookmarks list. Some people have wondered why we changed our favicon — after all, we hadn’t in 8.5 years(!). The reason is that we wanted to develop a set of icons that would scale better to some new platforms like the iPhone and other mobile devices. So the new favicon is one of those, but we’ve also developed a group of logo-based icons that all hang together as a unified set.