Who is SABDFL? What does he do?

SABDFL stands for Self Appointed Benevolent Dictator For Life, and is the nickname and IRC nick of Mark Shuttleworth, the guy who started the Ubuntu project.

http://en.wikipedia.org/wiki/SABDFL

Self-Appointed Benevolent Dictator for Life

Wikipedia:

Benevolent Dictator For Life or BDFL is a title given to a small number of open source software development leaders.