Part 1 of a series to teach you everything you need to know to master strobist photography techniques.
That Nikon Guy (Matt Granger) introduces the key concepts you need and runs through a simple demonstration.
Assumed knowledge:
Manual exposure intro: http://www.youtube.com/watch?v=gjpOazeHvRs
Example strobist images: http://www.youtube.com/watch?v=233YApEA7jw