Nikon has joined the brushed-aluminum shirt-pocket crowd with the latest Coolpix, the 3700. Less than 6 ounces and only 4 x 2 x 1.2 inches in size, this 3.2mp camera uses SD (secure digital) cards and has only one surprising feature: the Clapper. Yes, you can set the camera to self timer and clap to take a picture (any loud noise, actually). The 3700 should show up in stores in time for Christmas.