TiltShift.js - using jQuery & CSS3 to mimic tilt-shift photography (Chrome)
noeltock.com
noeltock.com
An example: http://jsbin.com/ekekug/2 (only Firefox, and I didn't reproduce OP's tilt-shift effect)
Also, I'm wondering if it's not better to use Canvas for performance reasons.
These examples were well chose to avoid this issue. The Empire State Building actually has the blur running vertically which is why you don't see it there. And the airplane is a great example because the front of the plane and the jetway are in a plane and the falloff was well chosen to start just above the top of the jetway.
These kind of effects always seem kind of pointless at first, until a company like Instagram comes around and almost defines their whole product around them (same with Pinterest and the Masonry layout). I'm sure very cool things will come out of the new CSS blur features too.
Tilt is a lens technique for miniature faking.
Shift is not related to miniature faking.
It is bizarre to name one faking technique after a different one, instead of after the end effect you are faking.