I started doing it primarily so that I could leave my work computer and start working almost instantaneously on my home computer. Since the Retina, I've been using the same machine for both but it's been less of an issue but it's still nice to know that you could lose the machine and not lose any work in any repo in your ~/dev folder.
Sounds like the only way to do it right now is via the Seadrive client proposed below - will definitely move to the first major provider that offers this service.
Sounds like the only way to do it right now is via the Seadrive client proposed below - will definitely move to the first major provider that offers this service.