Mike, Just think about how many times people blink... With a quick shutter speed you'd have like a 25% chance to shoot someone with their eyes closed (25% is just a wild guess, I really don't know :) But anyway, people blink really fast, so with a bit of a longer shutter speed the blink won't be as visible, or at least the chance that you'll capture the exact closing won't be as high as normal. Personally I like shooting walking people with slower speeds, cause the blur a bit....freezing a walking person often looks weird...no motion. Also I think that people who are in a hurry or nervous or whatever blink more than someone who's very relaxed. Also perhaps people who are focused on something blink less. But I'm not really sure....I'd love to know how that works. But anyway, unposed is much better....especially when people, cars, bikes, etc are going sort of the same direction at sort of the same speed, so you don't have to quickly capture that one special moment. Btw, want to share some work with us ? :) Have fun!