If you’re still looking for some good geek-friendly gifts, I have a couple kits available. My Blinkybug book/kit is available at Amazon. It has all the parts for making simple little blinking electronic insects, with easy-to-follow comic book-style instructions. It’s a great parent-kid project. Here’s a review on BoingBoing.
(Book cover photos by Lenore M. Edman, www.evilmadscientist.com)
Here’s a look at the inside, amazingly illustrated by Alexander Tarrant:
Blinkybugs sense movement, wind and vibration through there antennae, which causes their eyes to blink. It’s a very simple design using a coin-cell battery, a couple LEDs, and antennae made from guitar string, yet they have a strangely life-like quality. They’ve been a huge hit at the Maker Faire, and they’re a great way to teach kids basic ideas about electricity. Here’s one of the bugs: