I had some problems with incorrect album artwork on my iTunes. Couldn't get it sorted through iTunes so I did some searching and found iArtwork.
http://iartwork.net/
This software checks through your iTunes library and will correct any incorrect album artwork that either it detects or that you highlight.
You get 50 artwork changes free, then you have to pay for the full access, although there are ways of getting round this....
Maybe useful to some people.
Bomtek.
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