i already provided some evidence for evolution and Neoseminole has done a good job providing more evidence but i run across an argument that speciation or macroevolution hasnt been observed. This seems to be a common argument, which is downright false.
Evidence for rapid speciation following a founder event in the laboratory by J.R. Weinberg V. R. Starczak and P. Jora, Evolution vol 46, pp 1214-1220, 1992 - EXPERIMENTAL GENERATION OF A SPECIATION EVENT IN THE LABORATORY
Experimentally Created Incipient Species of Drosophila by Theodosius Dobzhansky & Olga Pavlovsky, Nature 230, pp 289 - 292 (02 April 1971) - EXPERIMENTAL GENERATION OF A SPECIATION EVENT IN THE LABORATORY
Founder-flush speciation in Drosophila pseudoobscura: a large scale experiment by A. Galiana, A. Moya and F. J. Alaya, Evolution vol 47, pp 432-444, 1993 - EXPERIMENTAL GENERATION OF A SPECIATION EVENT IN THE LABORATORY
MORE
http://wiki.cotch.net/index.php/Observed_speciationEnsatina
Ensatina eschscholtzi is a salamander that is in the process of forming two or more species. All the evidence supports this hypothesis; studies based on DNA, enzymes, geographic color variation and behavior give us evidence that this salamander has several points of incipient species formation. Two of the "subspecies" have differentiated to a point that they do not interbreed, which satisfies the definition of two species. And yet the populations that makeup this species are connected via interbreeding intermediate populations.
Ensatina is an example of a "ring species", where the environmental conditions suitable for their life is distributed in a "ring" around a central area where (mostly) they do not penetrate. In this case the ring in mostly an area surrounding the Central Valley of California. The distinction between species and subspecies is hotly debated with one contingent believing Ensatina eschscholtzi is composed of seven subspecies and another contingent believing it has already split completely into at least two species based on more recent molecular analysis. Ensatina is dealt with extensively in the literature:
THERE is more, i will post more as arguments arise. but once this fact is clearly established among christians and creationists how will you deal with it?