Oh, I found the cutest one about a month ago...I want to get it for my boys (they are almost 7and 5) and think they might be old enough to not seriously harm themselves on it now!
My sister and I found a great one, on sale even, when they were 5 and 3 but I just pictured them jumping off every part there was to jump off of...and it was too scary an idea for me! But I'm a worry-wort with seriously rambunctious boys!
The one I found has a slide from the top bunk to the floor and the other side has steps up as well that double as drawers and then 2 desk type sections on the bottom part...the top bunk goes one way and the bottom bed goes a different direction...oh man, is it cute!