Hah, truth be told it's more a matter of presentation than volume. It's just nice to have stuff laid out with some space between it. I was at a local jewelry shop and they had shelves in the same manner, done for storage reasons and it made good sense to me.
The hinges are by a company called Brusso. I like plain butt hinges for this sort of thing and they make pretty much the best available without resorting to a custom maker (bronze worker, ect). I've had some fellow furniture makers go as far as having a jeweler make hinges and pulls for them....but these fit the bill nicely.
I have a project coming up where I plan to use scissor hinges, so I'll detail those when it comes down to it.
BTW, here's how that coffee table is coming along;