It's only been a month since Mac OS X 10.5.3 came out, and today we have Mac OS X 10.5.4. As far as I can tell, Apple has never released operating system patches so close together. That's a clear sign that something wasn't quite right with 10.5.3 ï¿¼ as indeed, there has been with Leopard in general. Let's see what Apple gave us today.I've also never seen a Mac OS X update that had so few changes. In Mac OS X 10.5.4, you'll find a handful of fixes to the general code base, AirPort wireless networking, the iCal calendar application, and the Spaces & Exposï¿¼ functions of the user interface. None of those seem like show stoppers.