Let's be honest. A personalized wallet is a great solution when you don't know what to buy someone for a gift. Just choose a nice picture or an interesting dedication and your unique and useful gift is ready.
For anyone who's emotionally connected to electronic technology. Retired circuit boards, turned into coasters. If there are gifts designed just for your favorite geek then this is surely one of them. They're cut from real circuit boards so each set is unique in it's own way.