Adelaider.com provides a free Google Cheat Sheet PDF that provides all information about Google Inc and its services. This two page comprehensive PDF file contains the following information about Google:

*A list of all Google domains
*Company information
-Founded Date
-Key People
-Revenue
-Employees
-Contact Address
-Contact Phone & Fax
*PageRank
-Googlebot 2.1 Addresses
-List of sites with PageRank 10
-PageRank formula
*Google Form Elements
*Google Services
*Query structure to access directory listings of:-
-Music files
-Movie files
*List of basic Google Calculator operators
*List of advanced Google Search operators
*List of Google Investments & Finance
*List of fun Google services and tools
*List of 15 official Google Blogs
*Google Calculator examples
*Search by number examples

This is a must have reference sheet for any Google user - novice or advanced.

Download Google Cheat Sheet PDF here