This is a neat project. I've been slowing exploring some of these ideas myself both for work (offline field work) and fun (games and communications apps for running in the mostly offline world of a cruise ship). It's neat to see Mozilla exploring the space directly.<p>One of the hard parts here is that although mDNS is now a standard, it seems very inconsistently supported. It seems a shame that you can't just rely on <a href="http://mdns-address.local" rel="nofollow">http://mdns-address.local</a> to work on every device or at all reliably.<p>Offline capable peer to peer apps I think have a lot of uses and are a great idea. Hopefully something like this Mozilla project might push forward to some standard generally accessible to the public.