What hardware upgrades have you made to your Mac? A processor upgrade, hard drive, RAM, anything physical that you did (or had done). If you overclocked your Mac, then that's fine, so long as it was done via hardware (changing jumpers) as opposed to using a software based overclocker. Windows/Linux doesn't count. Everyone knows that you can slap together one of those from spare parts you find laying around. They are one giant hardware upgrade... downgrade... so please, Macs only. I've upgraded the RAM on both my Macs, and my dad's Quicksilver sports an extra hard drive and RAM.