We announced today that the developer version of CFMX J2EE Developer edition is now available for Mac OS X. What does this mean? It means that you can install JRun 4 on OS X and run CFMX on top of that, and do all of your ColdFusion and Flash Remoting development on OS X.
Christian Cantrell wrote a logged in article with some info on the announcement and has posted some info and links on here weblog.
You can find more information, as well as download all of the bits you need here.