I'm surprised no one has mentioned the website NerdFitness (http://nerdfitness.com/blog/) yet. Steve runs a really great blog for those looking to get started doing fitness. The forum there is a good place to ask basic fitness questions too.
I have heard about them, but they seem kinda cultish to me -- once you are in, you are in for life, we don't know diet soda is bad for you, but it is not natural, so it properly is, etc, etc.
