There is a very simple trick to keep your cutting board from sliding and will greatly increase your odds of keeping all 10 fingers intact.  This trick is widely used in professional kitchens and was even required practice in culinary school, but I've rarely seen it used among family and friends.  If you're already doing this...bravo!  

Step 1:  Wet a thin kitchen towel, rag, or washcloth, and ring out excess. 

Step 2:  Lay the towel flat on your prep area.

Step 3:  Place cutting board on top of towel...it shouldn't move. :)

Notes:

• This works with both plastic and wooden cutting boards.  
• You can also use a piece of non-slip drawer liner.