Last year, I posted two articles about Apple’s OS X 10.6 “Snow Leopard” and its new 64-bit kernel. The upshot was that, although just about every Mac made since mid-2008 is 64-bit capable, only the Xserve boots in 64-bit mode by default. Since my main computer is a glorious 27″ iMac that runs 64-bit Snow Leopard perfectly, I decided to permanently set it to boot this way. Here’s how you can set your Mac to boot 64-bit Snow Leopard, too!