Jonah points to link by Kottke to series of close-up photos of insects splatered on windshields. The images are truly cool and not gross at all.
This immediately reminded me of a funny, yet excellent book I read a few years ago, That Gunk on Your Car: A Unique Guide to Insects of North America by Mark Hostetler, which helps you identify the insects by the shape, size and color of the splatter they leave on your windshield.