Google's US homepage uses an animation to celebrate Isaac Newton's birthday. After loading the page, an apple falls from the tree to illustrate Newton's theory of gravity.
It's the first time when Google uses an animated doodle on its homepage. Now that users got used to the fade-in animation that exposes Google's navigation links, Google will try new ways to make the homepage more interactive.
Google Docs generates thumbnails for documents, so you can quickly preview files. For now, this feature is only available if you share a folder and use the special view for shared folders.
Google stores the thumbnails using Picasa Web Albums. Here's an example of thumbnail:
You can replace s32 with other values: s64, s640 to see bigger versions of the thumbnails. It's likely that Google Docs will add a grid view for managing files in a more traditional way.