Shot with my 20D, assembled in VirtualDub, edited in Pitivi. I had good success using aperture priority and the deflicker filter by Donald Graft.

Music: Stolen Thief by The Postmen
jamendo.com/en/track/591584

Read a quick tutorial I wrote about using free tools to create timelapses:
benholmen.com/blog/2010/07/create-a-timelapse-video-with-free-and-open-source-tools/