Well, it works. I finally completed the install today in an 06 Outback Ltd. When I started last weekend I got stymied by a screw in the cubby and had to get a 10 mm socket to clear it. When I started today I had no problems to speak of. The whole thing took me about 2 hours start to finish.
The only real glitches I encountered were minor. First, I had trouble with the screws holding on the heatsink. I had to try several different Philips heads before I found one that would work. LESSON: have some good screwdrivers. Old banged up drivers will make it harder.
The other glitch was when I hooked up the radio to test it. The CD wouldn't load. I unplugged the wiring harnass and tried again, and the second time it worked. LESSON: If at first you don't succeed, don't panic!
I used the inline ground gizmo that I got from Crutchfield. I hooked the miniplug from that to the aux output on Jazzy's board. After I closed up the radio I taped the ground gizmo to the underside of the radio (hope it will hold!). I routed a 6' miniplug to miniplug patch cable down the inside of the center console to a hole I drilled in the bottom of the cubby. The cord and charger will live there.
As others have reported, I have to turn the volume up relatively high on the radio (15-16) to get much sound, but the sound I get is excellent! I may get a charger with a line out to see if that makes a difference.
Everything went back together quite easily, and the only question now is whether or not I have introduced any new rattles or squeaks. So far this car has been very quiet (which I love). But then, it only has 3500 miles on it.
I want to thank everyone who has posted on this board. I would never in a million years have dreamed of trying something like this. I've built a computer from scratch but I don't know from cars! This was much easier than I expected.