I've been looking at this thread off and on since it started. There's some great images in here.
Here's my first attempts using already processed pictures in CS5. I haven't tried starting with a RAW yet. None of these shots were taken with this format in mind, so composition is sacrificed some. In terms of adjusting colors, the first and last are using the gradient maps. The second is using the sliders in color correction and curve adjustments. The third is adjusting the colors seperately in curves. C&C appreciated, especially on color tones and overall brightness / vignetting.