When searching for shared files with a Gnutella client, often I see whole strings of "keywords" pop up in a window when you have a file highlighted. How does one associate keywords and categories etc with image files? I would think this would result in a much greater number of hits than just going by the file name.
Much appreciate your help on this!

Good idea! The only issue, but which is already the case now, is the abuse of keywords. But users are savvy enough for that now...