data for panorama stitching testing
From a simple Google search...

http://sourceforge.net/adobe/adobedatasets/panoramas/home/Home/ 
http://www.ti.uni-bielefeld.de/html/research/avardy/index.html 
http://sun360.mit.edu/ 
http://www.iiia.csic.es/~aramisa/datasets/iiiapanos.html 
http://www.visualsize.com/mosaic3d/index.php