Allow the client to interoperate with non-Craft server software. After support for Craft is working https://github.com/satoshinm/NetCraft/issues/12 multiplayer support for web version, expand to other servers. Make a short list for review.
Took a different tack. Instead of getting tangled in complicated protocols, wrote a plugin for the Bukkit API, serving up a Craft protocol compatible server: https://github.com/satoshinm/WebSandboxMC
Allow the client to interoperate with non-Craft server software. After support for Craft is working https://github.com/satoshinm/NetCraft/issues/12 multiplayer support for web version, expand to other servers. Make a short list for review.