is the world’s first fully automatic 2D image stitcher. Capable of stitching full view panoramas without any user input whatsoever, Autostitch is a breakthrough technology for panoramic photography, VR and visualisation applications. This is the first solution to stitch any panorama completely automatically, whether 1D (horizontal) or 2D (horizontal and vertical).
Try the demo version (for Windows) and don’t miss the Panorama Gallery with breathtaking images. (via Linkorama)

I also suggest checking out the Panoramas group on Flickr:
http://flickr.com/groups/panoramas/pool/
I’m busily stitching together a couple panos now (though I am not using Autostitch).
Ahá… now I know why are you posting many of those pictures! Thanks for the suggestion Kevin!