The radically awesome Dr. Steve Novella of The Rogue's Gallery and Science-Based Medicine (which just added two new bloggers) tears apart three lame arguments against evolution.
(See also: How to argue with a creationist)
Orac of Respectful Insolence has an excellent post discussing the anti-vaccination crowd and why they have been able to gain such a strong foothold in the public discussion. He also has some good ideas for things that those of us with more rational minds can do to combat them.
EDIT: There is a follow-up post which addresses even more concerns and solutions regarding vaccines. Orac is not only very knowledgeable about the subject of vaccines and their actual side effects, he is one of the best writers I've run across.
Chanson from Rational Moms dives in and helps instill a love of learning in her child. That rocks.