There are an enormous number of websites offering advice and comment on just about every aspect of renewable energy. Some are excellent, some are not and others are a complete waste of time. Here is a list of selected sites whose content I believe has merit. I can't say I necessarily agree with all the content of each of these sites and you must make up your own mind. However, if a site has 'practical sense' and I think it may be useful to others, then it is added to my list.
Wind machines:
This site is an absolutely essential read before you even think about building your own wind machine. I have specifically avoided including too much technical information in my pages but this site will tell you all you need to know, and guide you around some of the many traps and pitfalls that wind machines present:
http://mb-soft.com/public/wind.html