Here is the, rather simple, troff macro package built during my presentation.
Here is a Lorem Ipsum written using the macros in that macro package. It's actually the first few paragraphs of the first chapter of The C Programming Language book, by K&R. As I do not covered fonts in the talk, the pdf has no embedded font, so it can look either good or ugly depending on the default font of your pdf reader (or browser, or anything you use to read pdfs).
Here is source code for that document.
The command I used to generate the sample document is the following. I used Heirloom troff (but was also tested on plan9 troff) and no pre-processor, but two post-processors: dpost (to convert troff's device-independent format to postscript), and ps2pdf to convert postscript to pdf (I also set the papersize to A4).

Here are the slides used at the presentation.