After months of off-n-on work, I finally completed the iTunes app skin for SumomOS. This is for iTunes 7.1, but may work for other 7.x versions. I will be updating my installed iTunes next so I can make sure SumomOS is up-to-date.
There are also other refinements, and the beginnings of an iPhoto 6 skin. iPhoto is an odd beast (more than iTunes was), and I don't know how far I'll get on it. iPhoto 7 may turn out to be easier to skin, and if it's a good improvement funtionally over v6, then I'll leave the iPhoto 6 skin as it is and focus on v7.