Mensa is the organization that really does care about its members but especially its members lesser gifted friends and family. They have a Holiday Gift Guide to help you find that special something for your specially gifted ‘know-it-all’.
Of course they’ve got magic (though not Magic: The Gathering thank god) and IQ Tests. And last but not least, there’s the 365 Mensa Brain Puzzlers Page-A-Day Calendar for you to buff up that IQ. 😉