So, you're getting Google Apps for your school/college/business! (or maybe just thinking about it). Either way it's going to be a great ride.
Of course you already know about why you have chosen Google Apps - If not, you can start here:
http://www.google.co.uk/enterprise/apps/education/benefits.html
But............there is more to Google than just their apps. It opens up a world of possibilities (and here's my top 5 of them):
1.