Hi Jay, hi folks.
Try using the most underused of SU's menu, namely the **Help menu**and its second choice, namely the Help Center.
You shall get here:
http://support.google.com/sketchup/?hl=en
Click on the first item on the menu at the left that reads: Learning SketchUp (a Trimble product)
This shall get you here:
http://support.google.com/sketchup/bin/answer.py?hl=en&answer=36207
You will see this:
•Quick Reference Card- an easy-to-print graphic of tools and their modifier keys.
Click that link and you shall get here:
http://support.google.com/sketchup/bin/answer.py?hl=en&answer=116693
There are a few links to dowload the cards for SketchUp and Layout and for Windows and Mac OS.
Just ideas.