How to Stitch Photos with Panoramic Software
I personally use Photoshop to create panoramic images such as San Juan and Seven Seas Beach but as I found out in this Stitching Panoramic Photo thread, you can also use various, powerful software packages to complete the job. Here are a few packages that will stitch panoramic photos together for you.
Panorama Factory
PTGui
PTAssembler
PTOpengui
And finally...here is a wonderful photo gallery by Max Lyon's displaying his use of Panoramic Factory and PTAssembler.