Okay, we've seen an iPad on a dashboard. Ready for some in-car PlayBook action? Recent RIM acquisition QNX is all over it, showing off what it calls simply QNX Car. It's a basic reference implementation of some technology that will be running the infotainment systems of cars in the coming years -- though they'll surely look very different than this by then. QNX is showing how it can pull media from multiple sources, like an