The FredCast and the Two Johns Cycling podcast do a lot of racing news, interviews and such with a little bit of general stuff thrown in. I haven't listened to too much of Bicycle Radio but what I have heard was mostly about cycle cross. Bikescape is from San Francisco and the Bike Show is from London and both tend to focus on the more everyday aspects of bicycling to the esoteric; episodes can range from a story on bicycle politics in San Francisco to a walk through tour of the Brooks saddle shop in Birmingham, UK. Perhaps the best way to describe both podcasts is that they're about bicycling and bicycling culture. I'm toying with the idea of doing a similar podcast myself about bicycling in the D.C. area although it is doubtful I could do anything of that quality. T-Chatter is put out by Terry Cycles and provides a lot of information about training, fitness, and diet. I'm not familiar at all with Competitor Radio. Considering the quality of the programming (good to excellent) and the cost (free), I certainly recommend downloading a couple of different ones from iTunes or straight from their websites and giving them a listen. You might get hooked like I did.