Gadget Lab | Wired.com says:
Gigapan makes hefty boxes which take your compact camera (or small DSLR) and, using stepper-motors, take a whole bunch of perfectly aligned snaps which can later be stitched together to make a huge, detailed gigapixel image — hence the name. The Epic 100 is essentially the same as the original Gigapan, only it can accommodate slightly larger cameras.