Here are some links to mushroom websites that I’ve got bookmarked:
North American Mycological Association
Caps and Stems This is a great site with lots of information about what is going on with the Colorado Mycological Society meetings and lots of additional links and references.
MushroomExpert.com Don’t miss this very informative and authoritative site.
Dave Fisher’s Marvelous Mushroom Homepage
Mykoweb.com A great source and even an online cookbook!
Anyway, those should get you started!