I've stayed away from cars from the big three for many years now, Japanese and German cars hold their value so much better. I got a VW Passat last year, not too much over invoice, and it is rated as having the highest residual value of any car in its class.
I tell you, the guys on the used car lots are desperate. They really, really want to deal right now. All the zero percent stuff has been killing them, as a glut of used cars hit the market and new cars are more afordable. I also think it will eventually kill off new car sales as well as they are just pulling foreward future new car sales.