Scott Hanselman and Jeff Atwood have been slowly building up a new development rig for Scott over the past month or so with Jeff giving blow by blow commentary on how he's put it together, tips and so on. It's a pretty good set of posts to read should you ever want to build your own.
The CodingHorror Ultimate Developer Rig Throwdown: Part 1 - The idea is presented and Scott's list of demands goals is kicked around.
The CodingHorror Ultimate Developer Rig Throwdown: Part 2 - Several possible hardware list. If only parts were that cheap...