My favorite Garr Reynolds of Presentation Zen just put together an extremely cool list of gifts (mainly books) based on what he has read or used this year. I wanted to buy almost all of them, since even though I am not a designer, I love books about design.
One or a couple would make great gifts for the designer in your life.
Garr has a clean, cool aesthetic. In my next life, I want to be able to explain things as clearly and create visuals just like him.