Google has developed a handy set of tips and tricks to help you use Gmail or Goggle Apps better. The tips are broken down into 'Ninja' categories ranging from While Belt to Gmail Master. The levels are supposed to correspond to how many emails you have to manage each day. I found the tips to be useful reminders about some of the unique features available to Gmail and Google Apps users.
It is definitely worth spending a few minutes thinking about how you are going to sort your emails. With the amount of emails many of us receive each day it is very easy to let some slip through the cracks.
Become a Gmail Ninja.