Pretty sweet. I'm planning on a 45W installation on the roof of my wagon. I hope to be able to eliminate the alternator except for going out of town. My 25 minute commute should be able to be solar, and if I need to plug in at home on cloudy days, that's fine by me!
I already got an Optima YellowTop (deep cycle battery). Now I just have to come up with $300 for the harbor freight solar panels!