Vincent Laforet (on behalf of Canon) gives a great introduction/overview of some basic timelapse techniques.
Michael Shainblum documents how timelapse are shot using the DP Moco and an eMotimo.
An interesting old tutorial on connecting and configuring GBTimelapse and the Dynamic Perception MX2.
Chris is doing some really excellent work explaining various techniques and technical issues with shooting motion timelapse. Here he covers the sometimes controversial issue of camera and bulb ramping. Not all cameras can really ramp the right way.