Why do I see a hits on a file called "favicon.ico" in my statistics?
favicon.ico is a special icon file that Internet Explorer looks for when it first visits the site.
Recent versions of Microsoft Internet Explorer, Safari, and other web browsers have a feature that lets web site owners define an icon for their site, which will appear in the address bar, the Favorites menu, and other places. If you create an icon file called favicon.ico in a directory of your web site, then any page in that directory that is bookmarked will appear in the Favorites menu with your custom icon. The browser checks for this file whenever a bookmark is created, so if you don't have the file, it will show up as a 404 (file not found) link. As a side note, this is a good way to see who is bookmarking your site.