I'm almost entirely switched to MediaMonkey as my total solution. I was previously using Foobar. I have been less than satisfied with the album art solutions in media monkey as the majority don't find covers for my music collection [it's mainly electronic music]
In foobar i implemented AlbumArtDownloader. I can right click a file select album art and the external program is spawned with the parameters passed to it. This solution rarely fails and i'd like to implement it into MediaMonkey.

I've tried to butcher a few scripts but i've had no success as yet.
maybe one of you super brains could implement it?

firstly, here's a link to the component:
Album Art Downloader @ Sourceforge
now, from foobar, i use a run script to execute:
"c:\program files\foobar2000\AlbumArtDownloader\AlbumArt.exe" "%artist%" "%album%" "$replace(%_path%,%_filename_ext%,)folder.jpg"
there's more info here at Hydrogen Audio.
so i guess all that's needed is to add a right click menu item to media monkey and pass the same params as above?
Any help appreciated. I'd love to get this working in MM3.