Purchasing a MacBook Pro 17 soon and wondered what you guys are using this slot for? Since I take a lot of pictures with a camera that uses a secure digital card, I was going to get an adapter to go there to be able to transfer the cards photos. I was also wondering if a usb 3.0 adapter might be able to be used to hook to an external wd hard drive that will do usb 3.0 and have faster transfers between the hd and the mbp? Any other uses the express card slot might give that would add utility to the machine? Thanks for your thoughts.