If you search via Google.com from a tablet today, you might notice some format changes. White space, button size/arrangement, and text have been adjusted in order to make the experience cleaner, better looking, and easier to use. The update is rolling out for iPads and Android 3.1 tablets in the coming days and enhances search aesthetics for both portrait and landscape mode. Give image search a spin as well, which now features larger thumbnails and continuous scroll.

Via Google Mobile Blog