Ikea hacking goes commercial with the Moddi: a DIYable murphy bed made from 12 Ikea Lack side tables and a bit of hardware. According to it's website:
The Only Floating Murphy Bed Available
The Moddi murphy bed is attached to the wall with the a french cleat. A french cleat is a technique cabinet makers prefer when installing cabinets because it’s an easy way to mount something big and bulky. But the coolest thing about a french cleat mounted Moddi murphy bed is that when it is folded up and away, it’s not touching the floor, leaving more room for other things!
And apparently, if you're skilled in the woodshop and have table and miter saws, you can build the thing for under $100.
The website is poorly written, and relies on alot of informercial lingo, but the project itself is pretty cool.