If you aren't hip on the un-Aquaness of the new iTunes 7, AquaT might just be the remedy for adding some of Apple's more standard UI elements back into their straying media software. As you can see, it brings the candy-blue scrollbars, light blue sidebar background and other various UI elements back in line with the rest of Mac OS X. It even goes so far as to make tweaks to some of the file type column names, like slimming down 'MPEG Audio File' to 'MP3' - great for those to whom screen space is a premium.
Now AguaT is free, and it works by replacing a few files inside of iTunes itself, so if you're at all worried about fubaring iTunes, or if you want to revert back to the regular iTunes 7, the author recommends (and I echo) backing up iTunes.app before applying this hack (clicking on iTunes and pressing cmd-d to duplicate it should suffice).
This looks like a well-done hack, but I agree with Dan: even though iTunes 7 is laughing at Apple's HIG docs, I'm diggin' it. Still, in the interest of 'to each their own,' I though I'd bring this to the table for y'all Mac OS X users keepin' it old school out there. Peace.