Yep, transfer switch is the way to go. We'll be upgrading the generator so that we can run the central air. It can get pretty hot down here and I don't want a power outage in 110* weather.
We originally bought the generator for the ISP we were running in MI in 1996, and brought it with us to VA. We used it more up north, but have had to use it three times down here. We lost the power for 2 days during Isabella. Without a generator it would have off'd all the fish if I had them back then. I was glad we had it because we ran a cable to our neighbor's house for their newborn, who was pretty sick.
As for the UPS, yah, read that thread today for the first time. Kris is gonna take a look at a way to convert sine/wave and see what he can do. He has a vested interest since he's in the middle of setting up a 92g reef tank.
Heaters -- not too worried about that since we have the furnace on the generator. The fish can take a 4* drop in heat and the house won't go below 74*, which is where I keep it winter or summer (unless my mother-in-law is here complaining that it's "too cold" for her

)
Our goal, as I said, was to have something in place that would kick in immediately and run some sort of alarm system that everyone could hear (I'm hearing impaired). The generator would take over after that.
Watcher -- you and my hubby would get along great! He's big into military stuff, loves blowing things up (was an organic chem major with an overtly curious sense of "what would happen if I mix . . ."), Networking Engineer, blah blah. I hope he comes up with something and will share with everyone if he is successful, or not.
Roan