We did some samples for a client trying to mass market an interchangable, reusable graphics system for prices, specials, etc. to the auto dealer market.
I tried this stuff: DRYTAC ViziPrint[SUP]®[/SUP] Impress and the material is amazing. It doesn't work with static, its got zillions of nano sized suction cups manufactured into the back of the material. The material is pretty stiff like a polyester, so you don't get the puckering and floppiness of static cling material. It took the ink really nicely and contour cut fine once we dialed in the right cutting pressure.
After that, we used more of it for some temporary auto clings for a local charity we do work for. They put them on both the side windows and doors panels and they stayed on even while being driven around for two weeks.