Google Trends Website where you can see statistics of searches performed on Google, in particular trends of certain terms being searched more or less with the passage of time in the search engine.
Google Books Ngram Viewer Utility provided by Google that lets you statistics and trends of word usage in books.
An Introduction to Google Search, The Google Company, & Other Google Products An introduction to Google, the company and search engine., and associated products.
Tutorial Series: How to Use Google A series of tutorials teaching how to use Google, the search engine, for beginners.