I know the official RIM developer documentation gives some general best-practice information (including some counter-intuitive stuff like making String constants not final) for the BB platform. There was also some mention of not going overboard with interfaces.
However, I do honestly wonder just how much of a difference all of this makes. Even when I have bits of poorly written and totally inter-mangled code, it actually runs fairly well. I also use plenty of inner classes and anonymous classes where it makes sense. When apps are slow or large, I often suspect it is really just complete and utter abuse of graphics resource data.
Of course you should always strive for clean and optimal code. That goes without saying. But as long as you handle String and image data cleanly, I'm not sure how much a lot of these other nitpicks matter.
