The "Deep Zoom" Feature in Microsoft Silverlight (Silverlight 2 beta 1) is pretty cool.  To play with it I made a collection of some of my daughters artwork.

Silverlight lets you zoom in, drag the page around, double click to zoom, etc.

Click on the picture to open a new browser window.  If you don’t have Silverlight installed, you can get it here.  You will need it to watch the Olympics on NBC.com anyway