Getting used to ribbons is hard for me and I still get the feeling that I click more than necessary.

So for all you mouse-lazy people out there (like me), I have made a pdf with the standard keyboard shortcuts used in Revit 2010. You can find that here.

To change them, edit this file:
C:\Program Files\Autodesk Revit Architecture 2010\Program\KeyboardShortcuts.txt

Don't forget to make a backup of your original!