If you want to put together a desk that fits all your monitors or other tech supplies, "lean pipe" is a great way to do it! Lean pipe was designed for factories to be able to make their workbenches and rearrange them however they want, on the fly. It's like building with plumbing pipe, only you don't have to thread the pieces, paint them, etc. It's also not incredibly heavy, and there are a lot more attachments.
All parts come from fitzkits.com, you can get individual parts or pre-made kits.
The parts bolt together with a M6 hex wrench, and the pipes you can cut with a hacksaw.
Step 1: Design Your Frame
If you have a pre-existing desk, you'll need to measure it and plan a frame on which to put everything. The easiest way to mount monitors is with the surface mount (you can use 2 or 4 of them, just arrange them in a 4" square to fit VESA-4 compatible monitors).
If you are building a desk from scratch, what I like to do is build based around standard wood sizes. Lowe's carries "kiln-dried panels" of solid pine that are cut in convenient, standard US sizes like 2' x 4', 2' x 6', 1' x 4', etc.
Figure out if you want feet or wheels on the base, or other features you might need.
The "commander's console" kits are pre-sized in 2' x 4' tabletops, but you can add a keyboard shelf or other shelves to the front, top or sides.
The poles and joints can hold more or less any monitor/pc, as long as you don't do a Frank Lloyd Wright and cantilever something heavy really far out. The picture of the weights was the way that I tested the weight capability of a rack to hold my PC.
Step 2: Wood Finishing
I finish the wood with wood stain and 3 coats of polyurethane. These are the panels that I suggest people use for the easiest/fewest steps.
Step 3: Examples of Build-outs
These are how some people mounted the equipment on their "battlestations". It's really up to you to see what works best for you!
Edit: I didn't go into too much detail because everyone builds theirs a little differently. If anyone has more specific questions, feel free to ask in the comments.
Here are some more documents that describe the assembly process.
Description of how parts go together:
More details on prepping surfaces:
Instructions for the "commander's console" frame:
Also, check out the subreddit at http://www.reddit.com/r/fitzkits for more project ideas!