Time Capsule Questions

Hi All,
I'm intrigued by the new Time Capsule and have a couple questions. I don't have Leopard yet, so I don't know how Time Machine gets set up. Here is what I want to do: I have a Mac Mini (I will add Leopard shortly) and am about to buy a Mac Book to replace my ibook. What I'd like to do is load all my music, photos, and movies onto the Time Capsule so that both the laptop and desktop can access them. Then, I'd like to have Time Machine back up the Mac Mini, Mac Book, and Time Capsule to an external hard drive attached to either the Mac Mini (where it is now) or to the the Time Capsule. Is this all possible? Any help is appreciated.