If anyone was wondering, I couldn't wait until spring and installed the logjam cable a couple weeks ago. The whole thing works like a charm. Here's an outline of what I did:
Parts: P.I.E. CHRY02-AUX auxiliury input converter (
http://store.yahoo.com/logjam/piechry02aux.html); patch cord with RCA ends; 1/8-inch three-conductor phone jack (Radio Shack part 274-249); 1/8-inch patch cord (to connect iPod to radio)
First, take the patch cord with the RCA ends and cut off one set of plugs. Strip the wires and sodder to the jack. (Follow the pin configuration on the back of the package or have someone with some electrical background help if you're unsure about this part. I had help from a friend who does a much cleaner job of soddering than I do.)
Remove the center bezel (as described on PTDoItYourself.net
http://www.ptdoityourself.net/) and remove the radio. You may not need to disconnect it, but it seemed to help. You'll also need to remove the panel with the aux switches to get a view inside the dash.
Once you have room to work, find a spot to install the jack. There are lots of possibilities for this, but I chose a spot under the aux switches, just ahead of the storage area and to the right of it. This way, when the patch cord is plugged in, I can still get to the storage area, but you don't see where the jack is located when the patch cord isn't plugged in.
You'll need to drill a hole in the dash, just large enough for the jack to fit through. For mine, a 19/64th drill bit did the trick. Obviously, this is a key part of the process. If you're not comfortable with drilling the hole, you might find a scrap piece of plastic to practice with and get a better idea what drill bit to use.
Install the jack, connect the RCA jacks, plug the convertor into the CD controller port and you're ready to test the system. You should now be able to select an Ext. CD setting through the mode switch. Use the patch cord to connect the iPod to the radio.
If all goes well, you can reinstall the aux switch panel and radio and button the whole thing up. I'd suggest wrapping the aux convertor in a rag or small towel and wrapping it with electrical tape to help keep it from banging around inside the dash.
I'd also suggest making a lot of playlists for the iPod so you're less likely to have to search for tunes while you're driving.