I think you are talking about the favicon.ico that every browser looks up automatically (afaik). Look for a file like that in your project and overwrite it with whatever icon you wish.
Hope this helped.
Exactly. Part of the reason I added the favicon is so that you can show your Seam pride for quick demos. For production applications, all you have to do is drop in your own favicon in the view directory. That's the beauty of having seam-gen assemble your project...drop and go!