The links below are to the Medical Algorithms Project. It has got to be one of the coolest, most comprehensive database of assessment tools I have found.
The first link (Neo & Peds) has the full alphabet soup of Neonatal Pain Assessment. The second is to the home page.
If you click on the "info" icon it will take you to the description, if you click on the name it opens the tool (which can be saved on your hard drive).
Warning: pop-ups must be enabled!
Neo & Peds
Medical Algorithms Project