Rock Band is awesome, I cant think of any other game that I've played that makes me and my mates feel like rock gods that are only alive to rock the virtual audience's socks off, hard. Even nowdays I'll pull out the worn plastic instruments of virtual rock, and blast away a few songs. It does get old though, who knows how many times I've played the same songs over and over. So the announcement of the Rock Band Network surprised me when I first saw it, mostly because that my Rock Band experience has always been crafted by the developers themselves. The Rock Band Network in theory should be like the iTunes store, where bands will be able to sell their recorded music over the internet and get paid from the sales except that the Rock Band Network will have the artists creating a playable track along with the music.
Sounds exciting does it not? The ability for bands to promote themselves over a game is great, the tools that the developers used being offered up to help the experience over. I just worry that the balance the game has created with the now "vanilla" tracks will be very different for each uploader. Still its a very good idea, and it only makes Rock Band a better game.