Very nice smoker! Yea, I'm hoping the rain will hold off here as well, I'm prepping some ribs and a brisket to start smoking first thing in the morning. I have a cheap Brinkman cube, but it does the job.
I have an Ethernet module that I haven't had time to play with yet, and was kind of thinking the same thing, meat probe(s), temp sensors, maybe even a couple of steppers to open / close the dampers to help with the temp. And of course logging it all on the pc.
If you are into smoking you might check out http://www.smokingmeatforums.com/. You'll find a real nice, helpful group of people there, and enough knowledge to keep you going for a long time.