Open Transactions. There is a lack of coherent and complete instructions and documentation regarding building an OT server that is ready for business and understood by a large community of developers. I don't understand how OT can send and receive BTC without operating on the block chain or interface with bitcoind. And end to end tutorial on OT would allow you to research more than just cryptocurrency it would provide an education on a variety of types of crypto financial instruments and encryption in general. There are already some great talks/videos out there on OT, but from my perspective they are given from the view of someone who knows the tech like their own hands.