To answer the OP, I accept common descent as the overwhelmingly best available explanation for a a great variety of phenomena in fields like molecular biology, biogeography, paleontology, and comparative anatomy.
Furthermore I accept random mutation combined with natural selection (and a few other mechanisms, such as genetic drift, etc) as the best explanation for how the relatedness that common descent show came to be.
I reject all forms of creationism in which species appeared "as is", based upon the strong evidence to the contrary, and the fact that no form of creationism I've ever been presented with has had any form of explanatory power.
Furthermore I reject so called Intelligent Design, seeing as how it is simply a "fancy" rewording of the age old canard "I can't understand how evolution could have done it, therefore God somehow by default did."
I agree with all of this, excellent post, Kent.
