lately i keep an eye on development of remoteStorage protocol by http://unhosted.org i believe you could count on support from folks there with unhosting annotator =)
I think this is a rather cool idea, and will look into it when I have a moment.
great! if you have any questions about remoteStorage you can catch main dev - michielbdejong at #unhosted (freenode)
I'm 100% in love with this idea. I've been searching for an excuse to play with unhosted stuff for a while.
1 year on, I haven't had "a moment" to look into it. I still think this would be cool, but I'm going to close this issue and leave it to the community to write an Annotator remoteStorage plugin (hint hint).