For those of you unfamiliar with tilt-shift lenses (photo courtesy of wvs), this explanation from Jake Dobkin of Gothamist illuminates everything nicely:
"Real architectural and fine arts photographers use Tilt/Shift lenses to avoid problems with converging lines and false perspective. These problems occur when you tilt the camera up towards the top of the building or scene to capture the entire subject. To avoid converging lines, the film plane (or back plane of the digital camera) should be parallel to the front of the building, and the camera should be positioned exactly halfway up the face of the building. This is great if you have a cherry-picker, but if you are standing on the ground, even a 6' tripod is still not going to get the height you need to avoid the distortion. Enter the Tilt/Shift lens. It allows you to shift the lens up while keeping the back of the camera parallel to the scene, and thus avoiding the distortion."
Basically, they're amazing. But for those of us who aren't quite ready to drop $1100 on a lens (though they can be easily rented for about $35 a day), this PhotoShop tutorial is actually quite effective if applied carefully.
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