Canon's TC-80N3 Time Controller.
Zach Wise at www.digitalartwork.net shares this video tutorial on time-lapse using Canonâ€™s TC-80N3 Intervalometer. This tutorial covers the basics nicely. I suggest testing it out a few times before putting it to work. Time-lapse is a great tool to have at your disposal if used properly. Click on the link for the video.
Click Here For The Video Tutorial.