Great thread! True, no music, but very good information.
Two thoughts: It is absolutely true that dull knives are FAR more dangerous than sharp.
And,'plastic' cutting boards are easily re-surfaced when they are scratched up, and are thus as dangerous as any poorly cleaned wooden board. Depending upon the size and shape of the board, it may or may not be worth the cost, but any knife sharpening service ought to be able to do it for you.