The GDC is at an end, and ION Storm has been kind enough to post the Power Point files for the various presentations given at the conference by members of the company on their website. Among those posted is the file from a speech by the witchboy on the topic of "Systemic Level Design": an overview of said methodology of design compared and contrasted with "special case" design, with examples take from Deus Ex and various other games.

Check the file here (requires PowerPoint Viewer) or view it in HTMLize format here.