The world was supposed to end Friday, so I held off on my Christmas shopping. Clever me. Why waste the time and money? The cataclysm was supposed to make the whole thing irrelevant. Now, with Armageddon averted and friends and family expecting something under their trees, I’m in a panic. My guess is you’re in the same position as me — I mean, if you can’t believe the Mayans, who can you believe? — and so, herewith, a handy last-minute gift guide.