does MorphOS include GOOD documentation related to making MorphOS-native programs?
http://morphos-dev.net/ has some info on how to get started.
In general the documentation could always be better, for sure... MDC has the SDK available, tons of info and (usually) helpful people:
MorphOS Developer ConnectionWe will be working on the new SDK with support for the new MOS 2.0 things in it, too, and plan to get it released as soon as possible. It will take some time, however.