It appears that Christian Matzke's Propping Up the Mythos is no more.
The site hadn't been updated in quite some time, but it was such an immense and useful repository of propmaking information that I just took for granted that it would be around forever. Mr. Matzke's work was one of the direct inspirations for my own humble efforts and the first place I received any kind of exposure. I'm genuinely saddened that it's gone.
If anyone has further information about the site's disappearance, or contact info for Mr. Matzke, I would appreciate if you dropped me an email.
Update: Many thanks to the commenters that pointed out the site has been archived by the Wayback Machine.