In honor of the biggest shopping day of the year, I've put together a list of books and DVD's that your skeptic relatives will definitely love as Christmas presents:
The God Who Wasn't There - This is a really cool documentary movie that pretty much any atheist/agnostic will enjoy. I mean, it discusses all the flaws of religion, Jesus mythicism, and has a goosebump-giving ending. Don't forget to print out Richard Carrier's critical comments on the movie and leave it in your recepient's stocking.
PBS Evolution Boxed Set - This is another one that pretty much any skeptic will enjoy: An 8 hour special on Evolution. 8 hours is enough to qualify as a 'gift that keeps on giving' and the show is fascinating. Of course, it's $70, so only give to the people you really like.
The God Delusion - Any skeptic who loves to read will enjoy this book, provided they don't already own it. So make sure they don't before you buy it (plenty skeptics have it). Otherwise, it makes a great gift.
Sense & Goodness Without God: A Defense of Metaphysical Naturalism - So you wanna buy something for your very bright, very well-read, college-sophomore nephew/son/grandson? Get this. It's a little deep, but a bright and well-read college skeptic will have no trouble understanding it. It's a superb book.
The Greatest Show on Earth: The Evidence for Evolution - Perfect for anyone interested in evolution or creationism. Also a good gift idea for your Uncle Dana who reads a lot of creationist polemics and makes an ignoramus of himself everytime someone mentions 'millions of years'.
Godless: How an Evangelical Preacher Became One of America's Leading Atheists - Get this for your skeptic relatives who already have 'The God Delusion'.
Skeptic Magazine Subscription - It's the gift that keeps on giving, all through the year! Every skeptic will love this magazine!