Genes, fossils, tetrapods, coelacanths, lungfish.... just read it.

Neil Shubin of the university of Chicago is mentioned in this article, and he is the discoverer of the "tiktaalik,"  a late devonian fossil some 400 million years old that represents the link between fish and land-dweiiling, four -footed creatures.  Fossils are exciting, but hard to come by, and they don't give us nearly as much information as genes.  Still, genes and fossils both re[present fertile ground to raise, explore and answer questions about evolutionary relationships.

From the New York Times:

http://www.nytimes.com/2013/04/18/science/coelacanth-dna-may-tell-how-fish-learned-to-walk.html