Web 2.0 (using the Internet to do work instead of your computer) truly gets more powerful every day. CleVR is a free online application (actually uses the Adobe AIR platform) that lets you upload digital photos and then it automatically stitches them together into a panorama format. And it does it quickly! I did the one shown here in just a few moments.
It also automatically creates an interactive version of your panorama that can be panned, zoomed, and scrolled which I have embedded below. This is my first one and it took me all of 5 minutes to sign up for the account, upload the photos and then get the final product.
CleVR » Free and easy panoramic photo stitching software, panoramas and virtual tours.