Papabear wrote: "What is "Darwinism?"
Well according to Stephen J. Gould, Darwinism is the theory of origin of life based on 'Lyellian uniformitarianism'. I.e. the extrapolation of small-scale, observable change in modern populations as the complete source, by smooth extension through geological time, of all magnitudes and sequences in evolution (PNAS 91:6764-6771, July 1994) whereby the sole creative force is natural selection (Science 216:380-387, April 1982).
It is a correct, though dated, term for evolution by natural selection (alone). Up to about the 1900s-1920s(?), when there were still competing theories of evolution such as Lamarkism, Darwinism was the description used to indicate natural selection. Today, Darwinism and neo-Darwinism are usually used when one is talking specifically about natural selection at the level of the individual creature or gene respectively.
The term was coined by none other than Alfred Russell Wallace (co-discoverer of natural selection), to refer to a strictly Darwinian (or Wallacian) view of evolution, in his book "Darwinism" (AR Wallace, 1889). See, "The Other Beetle-Hunter" in Nature 453:1188-1190 (June 2008) for a more.
(Edit: Holy crap, it's still in print!)