There's fast, and then there's really fast. And with that second bit comes Sony's newest memory cards. The XQD format still isn't a hot one just yet, only being supported by a handful of cameras (Nikon's D4 included). The new S-Series caters to early adopters on the bleeding edge, offered in 32GB and 64GB sizes and reaching transfer rates as high as 168MB/sec. If you want to take advantage of that speed, you'll need a Thunderbolt bolt. Take that, USB. All of that speed comes at a price, of course. The 32GB card is set to ship for $503, while the 64GB version goes for $754. Kind of like the early days of SSD: everyone wants the speed, but who is really going to pony up for it?