4.

CafePress offers another winning , including a customized Christmas stocking. Guaranteed to befuddle all but those in the mathematical know, this 19-by-9-inch, $12 beauty reads: "There are 10 kinds of people: Those who understand binary, and those who don't."

If you're in the latter group, you'll need to ask your Linux-head friend to explain.

5.

If you've got a shopping budget that's a bit bigger, then why not consider the iGala Linux-based, Wi-Fi-enabled photo frame? It can be hooked up to Gmail, Flickr or even your private albums. It's on sale from the elves at ThinkGeek, starting at $200.