Whydoyoustillneed tilt-shit lenses with digital cameras ? The first image was shot "as is" of the Saint Ambroise church in Paris with a wide-angle lens. The second one is the same one, but corrected for perspective distortion with hugin.
I've been going through a full immersive panorama phase recently that has me going shooting many pictures from one spot in all directions. I've even bought a new ultra-wide-angle lens (Canon EF-S 10-22mm) so that I have to take fewer pictures. I'm waiting for my spherical tripod head to arrive (Nodal Ninja). You can see more of my pictures here.