I opened this topic as most of us if not all of us want to have good tags in files.
My intention is to create list of useful sites for seeking Correct Tag Data and is not generally popular.
NOTE: Search Info that Search Site need to support most basic Track/Album info and Album Art if possible, clean interface (for possible easier scripting) if possible multiple languages.
One of German sites that helped me a loot recently and will serve as example is:
CIAO! Die shopping community
: (Example Of Search of CD I own
Please test sites with various number of CDs/Albums to ensure results. Above Example is tested on 15 Compilations that I bought yesterday and lots of results from them are missing on Amazon