I just found this Mac app today and it's pretty interesting (yet simple). If you follow multiple MP3 blogs, this tool will consolidate all of them in one nice interface and allow you to play and download any music files it finds. Think of this as NewsFire RSS reader but for MP3 blogs only along with iTunes interface and simplicity.

Looks like it will be priced very nicely at $14.95, but for now you can try it out while it's in beta for free! So get on it and let me know what you think and what MP3 blogs you frequent. Don't listen to any yet? Hop on the bandwagon, check out this blog directory and pick something out.