Hey Robin, so I guess I'll answer here instead of on my userpage [1]
After a quick look I got the impression that krpano is currently state of the art but you may know another program.
krpano is not an option, it is non-free. A alternative would be panosalado2, but last time I checked it had numerous problems, such as * lack of documentation * the need to re-project images into a cube panorama format before the multiresolution modus works (needed to get an improvement for large images over the current viewer) * lack of cylindrical projection support * lack of cut-off spherical pano support
The last two points mean that approximately 99.9999% of the panos on commons will NOT work with Panosalado.
Believe me I looked hard for an alternative, and all I got was hours of grief! Daniel
[1] http://commons.wikimedia.org/wiki/User_talk:Dschwen#Panoramic_viewer