Don't recall seeing this comment but if you do start it, you need to make sure that all of the moisture is evaporated out of the exhaust system. if you start it periodically over the winter and do not allow the system to come up to temperature for a while you will get condensaion build up that will eventually cause problems.
In regard to the tires, they can "flat spot" if it gets cold enough and you do not reinflate the tires (tire pressure can drop as much as 7-10psi in very cold, unheated garages) unless you put some kind of soft, thick, rubber mats under them or elevate the car, removing all of the car weight. In my personal experience, the flat spotting goes away after about 5-10 minutes of driving on them in the Spring.
As far as initial start up damaging the engine, I remember a test performed back in the early '90's when Mobil 1 was first introduced, an independant lab took a brand new oldsmobile 6 cyl out of a Cutlass and they measured the entire engine internals with a micrometer, they then ran the engine for for 100K miles, simulating all kinds of road conditions including initial start ups. They dissassembled the engine, and measured everything; the results, no appreciable change in any of the dimensions, in essence, no measureable wear.