The most recent issue of Wired magazine is all about Googlemania. One piece, How Would You Redesign the Google Interface, features concepts by Joshua Davis, Jenny Holzer, Shepard Fairey and the above piece from some unnamed designers at IDEO Product Development. I like the IDEO one the most because it represents the broadest thinking of the lot. Though I do love the aesthetics of both Holzer's and Davis'.
The Google Button