German bookstore Lehmanns, known for academic books, is selling Vi, Emacs, Linux, BSD and Latex reference mugs. They even got one with the number Pi and e on it.
For example, the Vi mug: http://www.lehmanns.de/shop/mathematik-informatik/5635112-97...
Latex: http://www.lehmanns.de/shop/mathematik-informatik/7361330-97...