As some of you know, Macromedia recently released both JRun 4 Developer Edition and ColdFusion MX for JRun 4 for Mac OS X. You can read more about it in the press release here and download both here. I installed both and my initial impression (I'm not a developer, so my impression could be wrong) is that JRun 4 is a more user-friendly version of EJB containers like the open source jBoss. I've followed the instructions on installing ColdFusion, and I can't seem to get it to work. For any J2EE developers out there, I want to know what your general thoughts are if you've tried them both.