These individually folding shelf units are making the blog rounds, but I object with how they're being billed by other design blogs as "space-saving" units. While I like the pieces and think they're pretty, I'm not sure how they would save you space; for one, things left on a shelf typically stay on a shelf; it's not as if you clear all your books and magazines off it on a daily basis, and even if you did, where would you then put them? Secondly, even if you were to fold up every single shelf, it seems you're gaining mere inches of extra room.
That being said, I find the pieces handsome. Called the Klaffi shelves, they were designed by Finnish architect/designer Eeva Lithovius, come in three different finishes, and can be purchased here.