Tip: dodgy artwork ? Fix it with AVSoft's Album Art Fixer
Link to product on AVSoft's site
I had forgotten just how good this product was until I had to reinstall my Media Center last week (yes even 'expert's' have to do reinstalls). It basically scans all your music and prompts you where there are problems like missing artwork or Album Artist entries. It then allows you to fi them in a very easy and intuaitive way.
Very highly recommended and if you use it and like it can i encourage you to donate.