QA1367: Discusses how to find memory protection violations or EXC_BAD_ACCESS bugs in Cocoa projects.
ok now this is a good start, ok not really that helpful. Really all is says is that if you get this then you lost track of your reference counting, but doesn’t really help you find it, just how to avoid it. So if it is too late what do you do, CocoaDev.com to the rescue.Debugging Autorelease. This has saved my sorry reference mis-counting butt more then once.