Wrote this for someone on polycount. Should be obvious to some of you but most people usually use the nvidia plugin the wrong way!
[Blocked Image: http://thiagoklafke.com/blog/wp-content/uploads/2010/07/normalmaptutorial1.jpg]
[Blocked Image: http://thiagoklafke.com/blog/wp-content/uploads/2010/07/normalmaptutorial_comparison.jpg]