Well here is an extensive list, not of shortcuts, but of links that can help you add a zing in your day to day work.
One piece of advice though: Don't try and learn all of them at once, just select a good shortcut everyday and make a habit of using it through the day and sharing it with others. You'll remember it pretty well by the end of the day.
Windows 7
http://productivity.ben61a.com/windows/windows-7-shortcut-keys.php
http://www.guidingtech.com/4535/windows-7-keyboard-shortcut/
Microsoft Word
http://office.microsoft.com/en-us/word-help/keyboard-shortcuts-for-word-HP005186664.aspx?CTT=1
Google Chrome
http://browsers.about.com/od/windowsbro5/a/chromeshortcuts.htm
Windows 8
http://www.redmondpie.com/this-extensive-list-of-windows-8-keyboard-shortcuts-will-help-you-adapt-to-the-new-interface/
Click on Read More for more shortcuts links.