I working slowly with my code because 2 things that are making my crazy. I doing everything first with unit testing, using: http://code.google.com/p/google-toolbox-for-mac/wiki/iPhoneUnitTesting I code a little, then build. If exist a problem, somewhere, XCode Freze & is necesary stop the build. I don't get any complain. With voodo I fix it, then work again.... but if exist a problem with I get 5294 Trace/BPT trap I start to learn that that men that somewhere a object have a trouble with memory assigment. I have enable zombies, but I don't see where that option give some usefull info.