Any free software available for stitching several individual photos into one panorama photo. Windows has one that works terrific but cannot find any for OS X or in I Photo 2009.
Google "hugin"
Not the most user friendly app, obviously capable of a great deal though. I followed some tutorials for basic stitching of flat images, in my case A4 scans of an A3 document. It did a good job of stitching them. And it's free...
See if you can get your hands on the software disk that comes with Canon cameras - it has a great Mac panorama stitcher. No idea if it would work with photos taken from a non-Canon camera though.