46 sunsets in 23 minutes. I was playing with the interval shooting mode on my Nikon D700, which allowed me to set my camera up to take a photo once every 30 seconds. I tried it on two sunsets on two different days. I think the results turned out pretty good.
I set the camera in manual mode and had it metered for the first shot, that way the photos would get darker as the sun set. It ended up getting darker faster than I expected, but an interesting effect. I like the clouds in the first one better.
I used Quicktime Pro to compile into a video, which was pretty easy. Just use the Open Image Sequence and select your photos, frame rate and export. I plan to play around with this some more.