iTunes Companion 5.5.1

This Widget searches for album cover art for your current iTunes track at amazon.com and downloads it to your hard drive.
The image is only downloaded once. The next time you play that track it finds the image on your hard drive. First it searches your hard drive, then the iTunes Library and if it doesn‘t find any cover art there, it searches at amazon.com.
If the search at amazon fails or you only get part of the image, you can search amazon manually from the contextual menu.
When an image is found at amazon.com a "Dismiss" button appears on the cover art. Click on this button if the image found is not what you want.
If you dont click on it, the warning will fade out after the number of seconds you have set in Preferences (15 seconds by default) and the artwork will be saved.
You can also dismiss the cover art later from the contextual menu, and you can set it to delete images in iTunes as well.
If no image is available at amazon.com, you can click on the jewel case or choose "Search with Google" from the contextual menu to search with Google or you can scan the album cover yourself. See "Drag and drop" below.
The images are stored in a folder called "CDCovers" in "Pictures" in your home directory.
You can also scan your entire library in one go without the need to play anything. See "Scan entire library" below.