Which Audio Files Have Album Cover Pictures?
 

Sometimes when I download audio files and then open them up, it has an actual picture of the Album cover picture in my media player. Also whenver I simply highlight the file it shows the album cover picture. I like this, so is there anything to look out for in search results for audio files that will signify which files do and do not have the album cover picture attached into them?

Not AFAIK, but you could put a request in for this option. http://www.gnutellaforums.com/new-feature-requests/