Not a bad idea Mabuchi540. It'd have to be a shoutcast stream or something, and to work would probably have to come from the USA to have access to pro drivers and unlimited data links..
I would listen, if it was in the right time zone, but then again i am an internet junkie - i work on the internet and use my computer most nights; but how many racers use thier computer at nights? I dont wish to detract from the idea though, I think it would be good and has worked with other online communities such as Online Gaming (Counter-Strike players used to have an online radio service that worked well; i never tuned in however..).
For the right person with the right amount of bandwidth it would be quite achieveable with a minimal outlay (a regular PC and easily attainable microphones from any electronics store would work fine). Hopefully someone takes the idea, and runs!