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@JonoMarshall
Zeroing the HD is pointless (unless you have something you want to hide) and will only put it through unnecessary torment, just pop the disk in and install, it will ask if you would like to upgrade (if there's a previous install) or do a fresh install - just do a fresh install.
Disk Utility should be used to reformat a new HD or change the formatting type if porting it from a PC, etc, feel free to start Disk Utility and make sure you're using an HFS+ formatted drive (recommended) before you go though.
OS X defrags (well not exactly, but the analogy's sound) as it goes along, as well as a host of beautiful background maintenance, so you don't need to do any maintenance on the HD side as you use the Mac, in general try to avoid poking around with anything and enjoy the simple Mac experience.