If you guys are interested, fain and bjgeiser have excellent homebrew apps called AmpachPre and Ampache Mobile, to be used with an Ampache Media server.
It's the same basic concept as Orb, but you run it from a PC or server on your home network.
Its not as easy to set up as Orb, but it is so worth it when you get it going. No more 8gb storage limit!