I tried Tahoe-LAFS, the setup seems a bit weird and from trying it on that public gateway a bit, there seem to be some issues in relation to what happens if you loose that link to your folder.

There seems to be no way of using it to simply attach and have a list of your data only.

I'm favoring Camlistore over Tahoe, though Camli has no good encryption yet and no erasure encoding. The basis of Camli seems to be better.