I just requested my invite to FreeAllMusic.com.  This is a new MP3 download service that is completely free.  You can download what you want but you will have to watch an advertisment to be able to complete each download.

So far two of the four big music conglomerates have signed on to be a part of this experiment.  The site has apparently lined up some big time advertisers that will hopefully allow it to stick around for a long time.

The best part of this service is that all the music is free of DRM (digital rights management).  This means you can copy, share, and do pretty much whatever you want with the music you download.  A majority of the early reviews that I have read are very positive and lets face the facts, you cannot beat free (my favorite word).