I've often wondered this. Last week rich hickey mentioned this at clojure NYC, and they only things he mentioned were the fully qualifying namespaces (which resolves to the original package it was defined in) and the auto gensyms. I assume this is enough in most cases and the auto gensyms take care of the rest. I don't think I'd trust namespace rewriting by itself though.
Right, and one without the other doesn't do the trick. You need both auto-gensyms and namespace resolution to ensure hygiene in Clojure macros (cleanly at least). On the other hand as lg mentioned you can intentionally capture using the pattern described. So you get the best of both worlds with the stipulation that the case of intentional capture is a bit more cumbersome.
