Mac OS X boot process

What happens in the Mac OS X boot process:

Nice write up about what happens when you boot your Mac.“Long gone are the days of OS 9, watching our Macs boot up with a series of extensions and control panels that we could always identify. Today with the Unix underpinnings of OS X, many users are entirely unaware of what is going on behind the scenes. So what exactly happens during the Mac OS X boot process? A segment at KernelThread carefully lists the sequence of events, from start to finish. It is fairly thorough and worth a read.