Portable Digital Timelapse Photography?

Bakajin asks: "The posting about the camera speedometer hack reminded me of my interest in portable time lapse photography. I wondered if the astute Slashdot crowd can make some suggestions for a very portable digital time-lapse system. I was initially thinking about a PDA connected to a small web-camera. I'll hack my own code if I have to, but I'd prefer to have something off the shelf or not involving too much work. Any suggestions on the PDA/camera/software combo or any different system?"