Basically I created Car Cast for my own use and shared it with anyone who wanted it. Some people find Car Cast makes them happy and they wanted an easy way to say thanks. So I created Pro. Please only buy pro if you already love Car Cast. There is no difference between Car Cast and Pro (just the absense of Ads.)
Enjoy your commute with Car Cast Pro. Cheaper than a beer, way more filling!
Car Cast Pro is a simple audio podcast downloader and player. Optimized for use in a daily commute or trip to the gym, it features big buttons, large text, remembers last played location. Car Cast Pro is based on Car Cast open source software.
See http://jadn.com/carcast/tour.gsp for a walk through.