Here is a link to a really great source of Tilt-Shift images, check it out at http://www.instantshift.com/2009/11/13/100-examples-of-brilliant-tilt-shift-photography/
Very special look and feel.
BTW there is an interesting site for this issue
love this effect as well. there's a nice telekom advertisement using it as well at http://www.youtube.com/watch?v=2Co2DogpFm8
just thought i post it as well... searching for the telekom ad link i stumbled upon this http://www.youtube.com/watch?v=VQ3d3KigPQM
flash mob advertising - would've loved to see it live