This one comes, via IM, from my Aussie friend Chris Clark - so all due credit goes to him.
EDIT / UPDATE: Chris Clark, the very person who provided me with this helpful tip this morning, is now giving some pretty good reasons why not to do it. So, before you read this post, read his.
WARNING: This process will take iTunes quite a while to perform. So do not do it if you don't have time to let it sit and do its thing. Also, do not do this if you have one-of-a-kind album art or you have scanned in album art, or even if you have albums in your collection from local bands that you've spent 8 weeks trying to find album art for them. They will not be found by iTunes' "get album art" feature. Also, you must have an iTunes Music Store account for this feature to work. That being said...
If you'd like to get new album art for your entire collection, and not just the albums you are missing (you can get brand new higher-res album art to replace that old-and-busted .GIF file you downloaded from Google Images), simply do the following few steps.
- Open iTunes
- Select every song in your Music library
- Cntrl+Click (right-click on Windows or with normal two-button mice), and select "Get Info"
- Click YES or OK to the warning about editing multiple tracks
- Select the checkbox next to "Album Art" (making sure the box is empty)
- Click OK
Once the process is complete, select your entire music library again, click ADVANCED > GET ALBUM ART. This should rip through your collection downloading all brand new album art via the iTunes Music Store.
Now the new coverflow view (which was bought by Apple), will be even more stunning.
You can download Apple's iTunes 7 from iTunes.com - and it is free.