I have received some really good feedback regarding my shader tutorials. Some of them contained errors regarding the normal mapping examples, where Rich-Talbot have been a great help.
I have updated the examples, and as you can see, the normal mapping shader has become much better! 😉
Modern art using the GPU 
Pleased to be of help :)Your tutorial series was VERY useful in getting me started with shader programming, so thanks again for all of your articles. Identifying and fixing any bugs was all a big part of the learning process!
Thats good to hear, hopefull many can use these tutorials to learn how HLSL works in XNA/DirectX! 🙂