As I have finally gotten around to cleaning up my files (getting their titles and tags right, getting them into iTunes permanently, etc.) I find that too often in the process Synergy will reach out and grab art I'd rather not have. This app appeared just a couple days into this process and has proved invaluable. Instead of drilling down to find the "offending" art, just with three clicks it is purged. The next time you run iTunes/Synergy, the latter just repopulates it's folders.

Buy this guy a cheap bottle of wine.