Today is
Darwin Day, the birthday of Charles Darwin (and for that matter, Abraham Lincoln). In celebration, here are some sites I go to that discuss evolutionary biology:
Talk Origins: A great resource for anyone looking for information on evolution. Also address creationist claims. Very academic tone.
Pharyngula: Blog by a biologist that has essays on evolution, debunking creationism, and cephalopods. Unapologetic tone.
Panda's Thumb: Blog associated with Talk Origins. Deals with biology and creationism. PZ, who writes Pharyngula, contributes here, but the tone is in general much more humorous.