I have found that most of the non-fiction I have sold involved a lot more creativity than my fiction. A friend of mine put it like this, "Basically you have boring instructions, it is like eating those flavorless rice cakes. To be successful, you have to find a way to make those damn things tasty!"

As a side note,there are two important things for non-fiction and how to stuff. First, spin an idea into as many articles with different slants as possible and always sell reprints.

PM, if you want any specific examples.