Last month, most of Apple's MacBooks were upgraded with SD card slots. The most popular 13- and 15-inch MacBook Pros both now have card readers. Apple even explains how to build a bootable SD card. Why on earth would Apple go through the trouble of explaining how to create a boot disk from an SD card? That seems way out in left field. They never did that for USB key drives. I think there is more to it than that. Apple doesn't just do things like SD cards. "You can just throw in a USB SD card reader" had been...