(Turbo-Torch @ Oct. 23 2006,18:44) +1 on what mikeo said!
Starting it up for no reason is the worst thing you can do. If you start it, it needs to be taken out and ridden for a good distance to burn off the condensation.
If you don't have bike stands roll it into a different position every 2 weeks. Flat spots aren't a myth. Previous owner of my Stingray had 4 brand new tires put on it, drove it home 10 miles and parked it until she sold it to me. Flat spots were so bad I couldn't take the car over 40 mph and it made me sick because the tires still had the chalk mark color in the tread along with some sticker residue. Fortunately she had the receipt with the odometer mileage and Firestone replaced them all for free.
The soft compound of a bike tire won't take long to deform.
As far as storage, I'm maybe an hour from you and I do nothing with the bikes. There's usually at least one decent day a month where I can get a little riding in. Supposed to be back up in the 50's this week.