The application gets a list of all the albums without 'artwork' and recovers it from Internet.
You can review the covers recovered by iArtwork in the program's interface, and if you're not convinced, delete them and move on.
If you double click on a particular album, iArtwork shows a preview of the suggested artwork; you can then click 'Previous' and 'Next' to see other possibilities.
Requires iTunes 7.4 or later along with Microsoft. NET Framework 2.0