XCode 1.2 out with Guard Malloc
XCode 1.2 is out, which is cool, but what's even more cool is that it includes Guard Malloc (well, a preview, but good enough).
Guard Malloc puts guard pages around each allocated memory block so that you'll die if you ever screw up memory access. Your app will run glacially, but there have been times I'd have killed for this.
Electric Fence comes to the Mac. I'm happy.