Eric Day and Patrick Galbraith spoke on Drizzle, Gearman and Narada at the July 2009 Boston MySQL User Group. This is part 1 of the video, which is about an hour long and is about Drizzle.
"We will explain what the Drizzle project is, what we aim to accomplish, and an overview of where we are at."
The slides can be downloaded from http://www.oddments.org/notes/DrizzleGearmanBoston2009.pdf
The User Group calendar item for this event is http://www.meetup.com/mysqlbos/calendar/10607736/