This website is from the Center for Metalloenzyme Studies at the University of Georgia.  It contains brief summaries of common techniques used in bioinorganic chemistry.  I really liked that for each technique lists what kind of information you can obtain, as well as what the limitations of the method are.  It also provides examples of what kinds of questions can be answered with each technique.  It does not provide in-depth information about how each method works, but rather simply lists the basic facts about each technique.