I did a time lapse of a huge tent going up for an outside event. Turned out really well and was easier than I thought it would be to set up. I used my Canon 40D with the Canon TC-80N3 remote timer.
That's the best time lapse tutorial I've come across. Wish I would have seen it earlier. I actually just bought an old used Canon 20D that I'm going to be putting into full-time time lapse duty. I did a time lapse earlier this month for my project and got hooked.
http://365project.org/marubozo/365/2011-04-07
http://www.post-gazette.com/pg/11111/1140981-100.stm
It seems we're reading about a lot of the same stuff today!