This site explains the Google resources available for education.
If you are anywhere where technology and collaboration are being discussed, you here about Google docs. There is a word processor, spreadsheet and drawing app. Many people are using these when they are collaborating with others on a document.
Since our Outlook calendar is available on any computer, google calendar is not necessary for work but Google calendar is an option for a classroom or group calendar.
Google reader enables a user to mark websites so that if there is any update on the website, the user is notified. It is basically an rss feed.
Google squared is a different way to search google where results are put in a chart format. This is still a beta (in progress) app but I think this is pretty cool. Give it a try, go to http://www.google.com/squared and put in Red Wing hotels.
Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites. Google Scholar helps you find relevant work across the world of scholarly research.