Well, as long as you don't profit from it, it might be okay, but like I've said, I wouldn't be making many assumptions, since copyright laws aren't exactly written with the consumer in mind.

The downloads, quite frankly, I wouldn't do them like you do, not unless the music's in the public domain, or you have permission to make the music available. It's all very complicated, since you're not making the music available, but rather some company is (whoever's behind YouSendIt, etc.), and who knows where the servers are, etc., etc.

I dunno. Lawyers are scary. :)

Anyhow, I think that if you added a counter to your site, you'd be surprised at the number of hits you get. :)

P.S.

Have you seen the Buffy comic?