FOOLPROOF: Too late to shop online. Even for flowers. Go local because there's no margin for error on this holiday; you don't want to be the one in ten thousand whose last-minute roses didn't get delivered.
CHEAP, BUT HEARTFELT: Go to Barnes and Noble for music (Ella for Lovers) or for sentimental novels -- hardcovers if possible, please -- like Gilead, Love in the Time of Cholera, Cold Mountain or The Shipping News.
CHOCOLATE: If you live within driving distance of a store where Michael Recchiuti's chocolates are sold, get some. Unless you live in or near San Francisco, in which case you can get XOX Truffles (the store is on Columbus, in North Beach).