HowTo: add a 300Gb hdd to your Mac Mini

I like the look of the new Mac Mini
Core Duo, but one problem with it is its extreamly small hard drive. 80Gb is
just not enough, and even 120Gb as the upgrade is still low (especially when you
think that my camera is shooting 8Mb RAW images). So, why not do what this guy did and add an
external 300Gb hdd. My question: Why only 300Gb? 750Gb drives
are out now!