Just read two drawbacks (the bottom hinge can easily be envisaged, donno why the idiots put it htere):
The D5000 doesn't gain the lovely 920,000 dot screen that appears on the D90 and more expensive Nikons. Instead it gets a 2.7", 230,000 dot tilt and swivel LCD. This can help make the most of the camera's Live view and video recording capabilities; however because, like the majority of DSLR live view systems, the D5000's live-view AF is so slow, it's not as useful as the concept might suggest. Which isn't to say it's a complete waste of time, just that it'll be more of a benefit for a minority of users with quite specific needs (working on a tripod, for instance), rather than being a feature that every buyer will use regularly.
One problem with this particular design, though, with the hinge positioned towards the base of the camera, is that the screen movements can become severely restricted or blocked once the camera is actually attached to a tripod. Therefore, you well may have to think about where you want the screen to go, before mounting the camera on the tripod. It simply doesn't work as well as the side-hinged design on Olympus and Panasonic cameras.
From DPREVIEW