Fish to lizards: the evolution of land creatures

I need to start reading Scientific American. I was pointed towards a wonderful article on tetrapods (the first land creatures descended from fish). It's a quite long summary of the current state of knowledge, known to researchers as a "literature review," but I find it to be fascinating. The article not only states what we know, but also why we know it to be true and explains how the observations are tied together by logic and reasoning. For those who already support the THEORY of evolution, it's a great example of it in action. For those who don't, it's still worth reading so you can see where we get our ideas from.