This is an example photo wall made by using a tool called CoolIris. The source of the photos for this photo wall is a photo feed from Picasa. The feed consists of the photos returned to me by Picasa when I ask to search their set of public photos for "Drum Corps".
Try out the photo wall. You can make it full screen by clicking on the diagonal arrows in the lower right corner. You can travel past a seemingly endless array of photos by using the scroll bar at the bottom or the arrows at the right and left. It even works with the arrows on your keyboard. You can click on a photo to enlarge it and see more detail.
The best thing about the CoolIris photo wall is that you can easily use your own photos in the wall simply by posting your photos on Picasa or another service like Flickr, and giving Cooliris a link to the album.