I've done a few time lapse movies in the past with excellent results. I can give you a few hints:
If your doing a time lapse film use:
Tripod
Remote Trigger (some have time lapse timers on them so you dont have to keep clicking for hours)
A big enough CF Card or tether it to a laptop. (Canon's software has a time lapse mode)
As long as there is no human contact with the camera your stills will not be shaking around.
If your planning on running the buffer up I recommend shooting in SMALL JPG format. You can shoot a heck of a lot more frames this way. Also be aware that shutter clicks put wear and tear on your shutter and that simply spraying away will shorten the life span of your camera. Most cameras shutter lifespan will run 50k clicks. Newer cameras like the 30d or higher are rated at 100k. 1d series are rated around 200,000+ None of this guarantees you will even get 10k clicks of of your camera before failing.. its only a rating like the one on your Cars tires. Clicks will also lower your resale value. Experienced photographers want to know
I don't mean to discourage you from the project. By all means do it! Personally, I would choose to use a camera that isn't your primary.
Meh, I don't plan on doing it very often. I would rather just buy a HD video camera if I was going to do this as a regular sort of thing.