Microsoft research have a nice tool called "Image composite editor" which is here
in use its just a matter of pointing it at the files you wish to combine and it will do the rest.
Installing it can be a bit of a trek, I just put it up on this machine and it first prompted me for the distributed c+++ install, and then for the latest .net install, and it might also ask you for silver light, which is on this machine already, but once you've down loaded and installed each of these, making panorama's is trivial.
Another fun tool is photosynth, again from Microsoft, the web site is here:
again this one is a case of just pointing the software at the relevant images and the results are stunning. I have a little bit more about this application/website in education here:
All the best
Laurence Cuffe