@ dawn: the different species have not been created. there are many examples where one can observe speciation (eg. different drosophila species on hawaii). the molecular principles that underlie slow but steady changes in the populations have been discovered as well. together with the archeological record and sequencing data from more and more species there is no doubt about the accuracy of evolution.
by the way, evolution takes place in many fields not just speciation. think about the development of languages. french, spanish, portuguese, italien all developed from the same ancestral language by small gradual changes.