Sounds like we want a generalized filesystem abstraction layer for Zenphoto, able to pull the originals from any source (Local server, remote server, S3, Bingodisk, box.net, flickr, etc. etc.) for any album or any group of photos. That would be awesomely cool, and very "Web Two."
Seriously a great feature for Zenphoto 2, I will add it to the spec. Thanks.
(FYI it's just in the wishful planning stages right now, nothing concrete)