@DDK - It was my understanding that tilting changes the angle of the focus plane. I haven't really played around with the tilt much yet, but i figured it would be good, if say I were point the camera up at a building, to try and get the entire building from ground to the top in focus. I will have to try and adjust the tilt as well.
You're quite right Alex. Tilting tilts the focal plane - not what you want (typically) when doing architectural photography. There is indeed a limit to how much you can shift, and very high buildings shot from close distances may well exceed those limits. But, even if you have to do some perspective correction in post, the TS-E certainly should help minimize how much correction is needed.
Tilting can be fun, but I recommend staying away from it for architecture (unless you really really want/need the effect)