This past weekend I visited a lovely small art gallery in Berkeley and, aside from the art, my New Yorker's eye was taken with the owner's desk. A really really simple design, with two custom "boxes" supporting a big, thick, generous piece of glass, we thought this was a great design to bookmark for the future...
The glass is about 1/2" thick and about 3'x5' in diameter. The boxes are made out of simple plywood on the sides and some kind of painted wood or melamine in the middles. I would guess the height of 30" for desk height, about 6" wide and 3' front to back for a total of 30"x6"x36".
The bases are simply boxes with no drawers, but you could design them to have drawers. Ordering glass at this dimension and thickness is easy and pretty much any glass store will do it for you. Building the boxes can either be done by yourself (:-)) or a local carpenter or cabinetmaker.
If you are looking for a desk, this is a great solution that won't cost a lot of $$ and which takes the edge off of the - usually - high tech feeling of a glass top. The warm wood and white background soften the overall design and make it a really lovely, cozy worktop.