Selective HSV, gaussian blur (RLE), brightness/contrast, curves, levels. Tuned the sky and the rest of the scene separately to get the best color. Used some gaussian blur and multiply to get a softer focus and get rid of some grain, then came back through with unsharp mask to bring back some definition. Rotated, cropped.
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What a pretty rainbow picture! The colors are gorgeous. Their seems to be quite a bit of noise in the sky and even some in the building. You might benefit from using something like Neat Image to remove noise.
Wow, cool idea and nice capture of the rainbow. It feels like the sautration got bumped a little past it's breaking point but it's very cool and good DOF.