From Matthew Brown:
Autostitch is a fully automatic 2D image stitcher. Capable of stitching full view panoramas without any user input whatsoever, Autostitch is a great new technology for panoramic photography, VR and visualisation applications. This is a solution to stitch any panorama completely automatically, whether 1D (horizontal) or 2D (horizontal and vertical).
Autostitch is incredibly simple to use! Just select a set of photos, and Autostitch does the rest: digital photos in, panoramas out.