An early peek at Longhorn | CNET News.com: "But while the OS bears plenty of similarities to Tiger, Allchin stressed that Microsoft has broken new ground in Longhorn. For example, document icons are no longer a hint of the type of file, but rather a small picture of the file itself. The icon for a Word document, for example, is a tiny iteration of the first page of the file. Folders, too, show glimpses of what's inside. Such images can be rather small, but they offer a visual cue that aids in the searching process, Allchin said.
Allchin said that Longhorn also goes further than Tiger when it comes to what one can do with search results, saying it offers new ways to organize and view the information. While the look of the OS hasn't been finalized, the translucent windows and other graphics tricks are expected to find their way into the finished software. "