I just read about a site called PodBop.org that allows you too look up musical acts coming to your town (or one near you) and download podcasts of those artists.
For instance, I searched for shows in Philadelphia, PA and the site produced a page of upcoming shows with links to information about the artists as well as direct links to one or two MP3 samples from those acts. However, the search also includes a link allowing you to download a podcast that includes MP3s of the artists coming to town along with information about their shows.
The site seemed a bit slow at times, but I do like the concept. Check it out.