Wow, this was a piece of cake. I'll be doing my wife's tonight. Jazzy, your enginerd status is the stuff of legend, and line-level iPod input in this stereo sounds FANTASTIC.
The one issue I had was with the RCA-to-Minijack adapter, it wouldn't plug in completely to the extension cable, and then wouldn't unplug. I got it resolved with audio stuff I had laying around the house, and voila!
I can't thank you enough, Jazzy! I'm kind of sad Subaru is including Aux-in in '07, because this was a fun adventure, and I learned to not be afraid to pull my center console apart.