Just a plug for Microsoft Research Image Composite Editor....

This photo in the header of my blog was created from four images seamlessly assembled automatically for me by Image Composite Editor. Don't leave your Programs Folder without one.This is absolutely the best panorama-making program in this half of the galaxy. Trust me. Would I lie to you? You need Microsoft's Silverlight and Visual Studio C++ 2010 Redistributable (and updates) to run it, but once those are installed, you'll be making the best panoramas you ever dreamed of doing. So do check it out!