Much is being made of the qualifications of the Republican pick for vice-president, or the relative lack thereof. In the area of science, the only statements in the media reflect Palin's credentials as a conservative Christian who is a creationist, who believes that creationism (or the barely-disguised intelligent design) should be taught in public classrooms. Defenders say that her apparently single public comment has been taken out of context (so out of fairness I link to a site I rarely agree with, here). Other reports detail her belief that global warming is not caused by humans, and that polar bears are not threatened, and therefore do not deserve protection under the Endangered Species Act.
It is a bit harder to pin down McCain's policy on creationism; he has been quoted on both sides of the issue, and he spoke last year at the Discovery Institute, the source of intelligent design "theory".
Second immediate update: Arizona Geology had the subject up yesterday