Today I wanted to spotlight an addon which I have been using for a while. It is so simple that you wouldn't think it would be so valuable. The addon digits created by Satrina, places a scaling and movable number showing your health and mana/focus/rage. You can show the number as either a percentage or an exact number.
Digits although old, still is very functional and is in fact currently undergoing a rewrite which will, according to Satrina, "allow you to make as many digits displays as you want for whatever units you want."
You can find digits at wowinterface.com here.
Hope you all find this helpful!