My wife saw something like this when she was looking at random things online.  It looked like such a good idea that I thought I would give making a new computer desk a try.  The design is fairly simple.  It is just a wood desktop that is resting on two shelves that are the same height as you want the table to be.

For the desktop I used 2″ x 12″ utility cedar from our local hardware store (Jerry’s home improvement) .  Three that are 5′ long and two that are 3′ long. All of it is held together with some decking screws

Overall it came out very well.  Only cost me about $70 in materials to build it including the shelves.  Now to screw together another one for the wife and everything will match