We're using them to deploy custom circuits for our P2P MMO, with funds at risk if you violate the rules of the game (using fraud proofs). You pre-commit to your penalty transaction and distribute it to your peers, allowing them to punish you for cheating.
Progress continues! It turns out writing the whole stack from scratch (without being a hobby implementation) is a monumental endeavor — especially if you want to support the many modern device types without serious performance drawbacks.
One subsystem at a time, slow and steady.