As soon as I read that Apple had released the OS X 10.5.4 update, I immediately threw caution to the wind and fired up Software Update. Fortunately, so far, my Macbook seems to be doing fine, though I haven’t really done much since the update.
My biggest interest in the list of fixes has to do with reliability and performance in regards to 5GHz networks, as I’m currently using an Airport Extreme Basestation as a wireless access point for my Macbook.