Another step I add which I haven't read in any of the tutorials is I try to skew the color to reflect shitty indoor lighting. I don't know if it helps, but that's my story.
here's my first try ... bangkok, dangerous?
feel like my focal area may've been too small or maybe i just wanna play with making that entire arch in focus while tilt-shift-faking the rest ... sounds hard! we'll see {=o)
i've been doing some of these for a little while as well. 2 are from disneyland (california adventures) & 2 from inside a recycling center: (i love that universal backlot image.)
i made the one below a little while ago and shared it with a fake tilt focus group on flickr. soon after it got mentioned in a short article in the New York Times magazine about the popularity of the effect.