I found a very helpful tutorial on tilt-shift photography on this site. I've just started to experiment with my new Canon TS-E 24mm f/3.5 L II lens.
I'd like to show you some of my first experiments, and ask if you have some comments on these.
This one is probably a little over-tiltled, although vertical lines are real vertical. A little optical illusion.
tilt-shift 06.jpg
Vertical lines look better here.
tilt-shift 04.jpg
And some selective focus I like here.
tilt-shift 12.jpg
Cheers,
Jelte