Figured someone here might be interested in this. A while back I did a single segment speedrun (no saving/loading) of Penumbra Black Plague in 17:21 which is the fastest known time of the game. The low time is mostly possible thanks to glitches like clipping through walls and item flying.
http://www.youtube.com/watch?v=RzU_z5XrO_w
Before I did that run I also recorded a tutorial on speedrunning Black Plague. If anyone is interested in trying out running BP or just getting more insight on what's going on in the run, I recommend checking that out.
http://www.youtube.com/watch?v=mv9vZTbudSo