I've posted on http://www.YouTube.com/UltraStableColor a 4-part video of Tod Gangler making a color carbon print. More of a "demo" than a "how-to", the most important feature of the video is its portrayal of how a master printer works with, and thinks of, his materials. Carbon is a simple process when an understanding of its basic principles is grasped. Following (often incorrect) processing steps by rote is the short road to failure.
Each part is 8-9 minutes long, and although severals steps are not included due to time restrictions, its a good presentation of the process (best to view them in the 1-2-3-4 order). More detailed information can be found in the UltraStable Process Instructions.