If you like panoramas you might enjoy trying these two free (!) panorama viewers.

WPanorama, available , is a wonderful dedicated panorama viewer, and also a screensaver, with numerous features. These include window or full screen scrolling in either direction at any speed, with optional auto reverse. It also has the mind-bending option of adding a mirror image to the view, which makes it possible to have any panorama scroll continuously in one direction with smooth but strange joints. All this also works as a scrolling full screen panorama screensaver, which even has a playlist and separate settings for each picture.
Any scrolling panorama can also be saved as an AVI movie.

Dimin Image Viewer, available , is a general viewer with an entertaining full screen scrolling panorama option. Though the program is very quirky, and maybe a bit buggy, it's worth the effort of figuring it out, particularly for the feature of being able to grab the panorama with the mouse and throw it in either direction, up to warp speed if you like.