In Leopard, after installing it I'm unable to open iTunes due to supposedly not having enough memory. After uninstalling it, iTunes opened fine. Just a heads up.

What I really would like is...

1. A way to allow double scollbar arrows again.
2. A way to return the larger-radius rounded corners to the iTunes window.

I was able to use his with 10.3.9 simply by manually showing package contents on the installer app and manually copying the .rsrc file I wanted from Aqua4iTunes.app/Contents/Resources to iTunes.app/Contents/Resources and replacing the old iTunes.rsrc by deleting the old and renaming the new. Just be sure to make a copy of iTunes.app first just in case.

I'm the one who originally listed AguaT here, but I preferred Aqua4iTunes' bottom buttons so I switched after the iTunes 7.0.1 update had brought me back to the standards iTunes 7 look anyway.

Excellent.
Slightly more versatile than AguaT (allows uninstall) and gives a closer look to iTunes 6 than AguaT too (for instance, you have aqua buttons at the top, and metallic ones at the bottom, rather than forced aqua all over). It doesn't alter the icons, but then I'm already used to the blue already :) (green looks old now)
There are 4 looks to choose from:
Aqua Blue
Aqua Graphite
UNO-style Blue
UNO-style Graphite

If you already have AguaT installed (like I had) remember to revert to the iTunes 7 standard default first by re-installing iTunes 7 (have to trash iTunesX.pkg from reciepts). This way, when you "Restore Default look" in Aqua4iTunes, you go back to the original iTunes 7 style rather than the AguaT hybrid.

Also, when installing/uninstalling, remember to quit iTunes first. This version works with 10.4 onwards