I'm not clear, though, on what they consider a "release."

I don't know. I'm guessing that release=CD because they consider a "label" anyone with 5 or more releases. If a release=track they'd have an awful lot of "lables" to deal with! The exception to this is if they expect people to deal in singles, but that doesn't make sense with all of the "CD" talk. Still, I might email them and find out.

The reason I asked this is that I was trying to decide if I should set up my own site to do this, but if I can send people over to iTunes or even amazon.com to buy a CD, that's a better deal than trying to maintain my own, non-publicized website, even if the profit would be far less.