DSLR Video pioneer Vincent Laforet partnered with Canon to create a 4 part instructional video series where he shares many great tips for getting started with shooting timelapse sequences. He takes viewers with him on a shoot in Bryce Canyon and explains his setup, and also goes in to detail on: finding a subject matter, lens selection, how to calculate properly to get enough frames, using intervalometers, and so much more. This is loaded with tons of great tips, a must watch if you do any timelapse work.
***UPDATE*** For some reason Canon deleted one of the videos and made the other private. If you go to Canon's DLC page here, you can see the videos. Click on the "Large View" to get a decent quality.
Here is the second video from the series, with the remaining two videos available on the Canon Digital Learning Center website.