HD View is the new viewer from Microsoft that displays very large images. I mean REALLY large images. How about 2,045 12 megapixel images stitched together? You have to see this.
HD View Beta³
HD View is a viewer that allows you to see large gigapixel panoramas by zooming and panning through your web browser. There is a lot more to it than that but I am not going to talk to the specs on this one. Just go and get the viewer and start the fun!
http://research.microsoft.com/en-us/um/redmond/groups/ivm/HDView/HDGigapixel.htm
Installation
Installation is easy. Just click on Install HD View and follow the prompts.
After the installation is complete, refresh the link or click below:
http://research.microsoft.com/en-us/um/redmond/groups/ivm/HDView/HDGigapixel.htm
and install the ActiveX control:
and now you are ready to start looking at some incredible panoramas!

This is so cool!
Andrew
Take a look at SeaDragon for something similar from Microsoft – http://www.seadragon.com/ .
Nothing to install and some of the examples are amazing – http://www.seadragon.com/showcase/chris-jordan/