This is tangentially related, but here is less OT than in most discussions :)
I'm currently building http://www.bandol.it, a Humble Bundle clone targeted at Italian Independent Music (and, maybe, books).
I'm experiencing the dreaded chicken and egg problem: bands won't give me their music if I don't have a big following, while people won't follow me if I don't offer them good bands.
How did Humble Bundle solve this?