Google Apps brings together essential services to help your students, school, group or family communicate and collaborate more effectively. These services are powerful, easy to set up, require little-to-no maintenance, and are available for free - yes free. The beauty of using Google Apps is that you and your students can access work from any computer at any time. No need for access to a hard drive or server..... welcome to the "cloud".
Everything is unified by the Start Page, a central place for you and other users to access essential content, documents, presentations, gmail, sites, and search the web.
Below are great tutorials about Google apps: