Google "Even More" - http://www.google.com/intl/en/options/
Try some of these...
Google Almanac - A Google Site Created by GTCs (Kyle Brumbaugh, Jerome Burg, Cheryl Davis, & Kathleen Ferenz) for the GTA
Google Hacks - A good reference book. The first half or so includes some great tips... the rest gets a bit technical.
Googlepedia - Another good reference book to use when teaching particular applications.
Google Earth Lessons - A bunch of lesson plans.
Google Aps Tutorial
Google Lit Trips - By Jerome Burg
Google Channels on YouTube