Found in a recent link from Slashdot to an entry of Phil Ryu's blog about the top ten most beautiful Mac OS X apps - coverflow puts to a good use these neglected cover art pictures in your iTunes library and turns them into a fluid, intuitive interface to select albums you want to listen to. Now if only Apple would listen :)
To make it even more useful on my laptop, I decided to finally clean up the cover art in my iTunes library. After trying a few shareware, I found iPodSoft's Iart worked nicely to recover lost covers on windows. It allows recovery of images from multiple search engines (amazon, itunes, ...), creates a playlist for albums that do not have a cover (to search them manually more easily) and even recovers Lyrics :)
Update 09/12/2006: coverflow has been officially sold to Apple for inclusion of the technology in iTunes 7 ! now you don't have to have a mac to rediscover your cover art.