Infophile has an excellent blog over at Infophilia.
Over the past few months, he has put together an outstanding series called, Why Skepticism?
I've been meaning for sometime to put up an index to this series for my benefit, so here it is:
Why Skepticism? (Part 1)
Why Skepticism? (Part 2)
Why Skepticism? (Part 3)
It's worth ploughing through parts 1 and 2 in order to contextualise part 3 - but may I suggest that you print these out and read them on the train on the way home from work, or something.
Parts 1 and 2 are pretty heavy going.
Part 3 is great if you read it on it's own, but even better if you take the time to fully parse the first two parts.