Where is the best place to get missing album cover art for iTunes 7?

I just bought a MacBook Pro and finished ripping all of my CDs. Some of the album art was not downloaded. What is the best way to get the ones that iTunes misses?

 

Amazon. I also found this widget which downloads the album art and imports it to iTunes.

 

Edit: N/M I see now you're using a mac.

 

Thanks for the tip! Ironically, I was downloading the images manually from Amazon. I could not figure out how to use the widget though. It was not clear.

 

I think you have to enter the album name in the search bar and press enter or click the button. I cant test since I dont have a Mac.