Kid's Desk - from BuildEazy
How to build a simple kids desk from plywood.
This kid's desk uses a tongue, slot and wedge system to hold most of it together.
Once made, the desk can easily be dismantled.
All the desk panels can be cut out of a 4ft x 4ft (1200mm x 1200mm) sheet of plywood, which is half of a standard size sheet.

Built in desk - from HGTV
How to build a simple desk in the nook of a bedroom. Tools list, good instructions. Ft and inch dimensions.

Computer workstation - from Minwax
A selection of furniture plans. Scroll down the page for the computer workstation plans in pdf file.
The computer workstation is a strong sturdy desk that will last you years. By building your own, your total cash outlay for materials will cost you a fraction of what it would cost to buy a commercially built table. This plan has easy to follow instructions and a tool list. Plan is in Ft and inch dimensions.

Wall desk - from BuildEazy
How to build a wall mounted drawing, drafting and writing desk.
This drawing and/or writing wall desk is designed to take an A2 size paper sheet or pad. This is a most practical desk to have in an office and positioned handy to the work area with an A2 pad sitting on top of it to jot down notes, memos etc as well as conveniently write and draw, you will wonder how you ever got along without one.

Hanging wall desk - from Hands On
A fast and easy to build information center. Good pictures and easy to read instructions, list of materials and assembly. Ft and Inch dimensions.

How to build an office desk - from Popular Mechanics
This one has plenty of storage space--seven drawers in all--and plenty of surface area too, nearly 16 sq. ft. Its cool, clean lines suggest a seriousness of purpose that's good for any work environment.