First tip Dō Thē Rīght Thīng - Add macrons where they belong when using written Māori.This is is one-off setup of your mac involving setting up the Māori keyboard as an input (yes Apple include Māori as an international keyboard).
After that holding the option key down while typing a vowel will produce the required macron.
Second tip Drag and Drop on Speed. Dragging and dropping has always been a Mac OS mainstay but you can work faster and smarter by really pushing this feature to the max. You will be surprised what can be dragged and where it can be dropped.
Force opening apps, file transfers, grabbing images, inserting and attaching gets really fast when used in combination with the 'command-tab' and or Expose features
Third tip Smart FoldersThe advent of Spotlight searching sent my orderly filing regime out the window. But I still need to group documents, photos, media and other files together for certain purposes. Smart Folders let objects exist in multiple places and are a powerful productivity tool for busy teachers & principals.
http://theappleblog.com/2010/01/13/the-smart-mac-smart-folders-in-os-x/
Fourth Tip Mail RulesApple's Mail app can be simply configured to make sure messages self-file in the right place. Also great for keeping overloaded inbox stress levels under control.
http://www.ehow.com/how_2271237_manage-email-rules-apple-mailapp.html
Fifth Tip Spanning Sync - Google Calendar's best friend. http://spanningsync.com/Great if you are a Google Cal etc user but still like the elegant features which link Mail etc. to iCal, eg. hovering over a date/address or phone number to auto add to contacts.
What if you could combine the speed and elegance of iCal and Address Book on your Mac with the power and simplicity of Google Calendar and Contacts? Now you can.
Spanning Sync keeps your iCal calendars in sync with Google Calendar and Address Book in sync with your Google Contacts, so you get the best of both worlds.
Sixth Tip iPhoto sharing.Maximise kids' learning time with the use of iPhoto's built in sharing feature. Too much learning time gets wasted putting photos on servers, USB drives or passing cameras around the room. Set it up and go for it. http://www.apple.com/ilife/tutorials/#iphoto-hero
Principal at Waimairi School My blog is here