I started scoping out an outline for the RxJavaFX/RxKotlinFX Guide, which will follow along the same lines as the TornadoFX Guide. I'm going to start this in October after I finish my O'Reilly webinar and the TornadoFX Guide. My vision is that it will teach RxJava from scratch but from a UI perspective. It will assume no previous knowledge on reactive programming, and I think this is fine since reactive programming for UI's is a pretty specific application for Rx. If there is anything you guys would like me to include in it, let me know in the next two months.