Okay, so as far as I know... Radioblog is an internet jukebox program that provides you a program that converts mp3s into a different sort of format (RBS I believe?) that it then plays using a script provided when you download it. Unfortunately, it does require that you upload the RBS files onto your own server. However, as far as I can tell, there is no way to download any of the tracks that are uploaded using that program. So... It's basically allowing other people to listen to songs that you have uploaded, but not allowing them to download them for personal use. Thus the... "radio" part of the title, I guess.
As for what I planned to do... I really only wanted to uploaded around 10-15 songs to give my friends and other interested art colleagues an idea of what I listen to without resorting to sites like yousendit.com (which is DEFINITELY not legit, whooeeee!) Typically, if you can get the radioblog to work correctly, it pops up in a different window (oh, and it doesn't have any ads) and then you click on the track and it (usually) plays it.
If you're really worried about the copyright issues, let me know and I won't upload it. That's why I wanted to run it by you first, because I figured there might be some worries there. I may be able to create an atspace.com account just for it as well if I get that desperate.
Hope that helps! Let me know if you have any other questions.