I finally made it down to the Blood Center to get a donation in. As of late, I have begun doing a double red donation. It takes longer, but you don't have to go in as often, and you get hooked up to a really cool machine. It actually pulls out your blood, separates the red blood cells, and then pumps everything else back into you. But, when it starts the return it makes your arm get quite cold. It's not unpleasant, just a little weird.