I first posted the AutoCAD Keyboard Shortcuts back in 2008 and many have downloaded and add to my list.
Here is the updated list for 2012 versions of AutoCAD and the various products that use it as a platform.
Here is the new list: AutoCAD Keyboard Shortcuts-2012 
An added bonus – the last page lists discontinued shortcuts from prior versions.
Thanks so much to Heidi Hewitt  who helped me with this update.
Over the years many have comments and provided additional shortcuts. You can see the old post with the many comments with these links:
2008 Keyboard Shortcuts – old PDF  (2008)