Okay - here's where we are:

1 - After seeing the fluctuations in the battery readings, and thinking ther was a little too much of that - confirmed by a voltmeter - I decided to replace the battery, which was interestingly an MB battery, and for all I know may have been original.

2 - Opened-up the battery compartment (read: pulled the rear seat), and the insulation covering the battery was pulled-back. Clamps on terminals seemed a little bit loose, but nothing catastrophic.. Still...

3 - Replaced battery with the appropriate Interstate (MTP-93, $130) and put it all back together. Reset headrests and windows per instructions in the owners manual.

4 - Car fired right up, CE light still on. Voltage readings seemed steadier. Drove around the block - so far, so good. That was Wednesday evening.

5 - My wife drove the car yesterday - about 60 miles - and after her first drive the CE light went back off (before I was able to go and have someone pull the code).

Since then, no problems. My fingers are crossed. If nothing else, this certainly appears to be *related* to the trouble. Hopefully it is cured. I am knocing on a LOT of wood right now....

Stay tuned!

-Reed