If you're still looking for a Christmas gift for that special nerdy someone, consider this: The Cult of LEGO, by John Baichtal and Joe Meno.
According to the book's description, "LEGO is much more than just a toy—it's a way of life. The Cult of LEGO takes you on a thrilling illustrated tour of the LEGO community and its creations. ... In this full-color coffee table book, you'll find page after page of photos showcasing the fantastically creative and complex models built by the LEGO community. You'll marvel at a life-size stegosaurus, a microscale Yankee Stadium, a 22-foot long World War II battleship, a MINDSTORMS-powered monster chess set, and a remote-controlled Jawa Sandcrawler (with moving conveyor belt!). Visit the conventions where LEGO fans gather to socialize and show off their work. And discover the serious side of LEGO, used in therapy, prototyping, and teambuilding."
I've never had any LEGO sets myself, but I'm a big fan of the LEGO video games and I've admired the countless inventive models and miniatures that LEGO fans have built all over the world. Since I already have the LEGO Star Wars: The Visual Dictionary (which is a pretty sweet inventory of LEGO-ized Star Wars stuff, both official and fan-made) to go with my other Star Wars reference books, I'll probably pick up this up sometime soon. What can I say? They had me at "remote-controlled Jawa Sandcrawler".
Furthermore, if you order a print version of The Cult of LEGO from its publisher No Starch Press (click here), you will also get the e-book version for free. That means that you can actually read the book anywhere you want with your e-reader of choice while the print copy remains safe at home in your geek collection. Sweet!