This is an example if what can be done with a digital camera. I went to shoot this building at dusk. When the sky was right the building was too dark. I exposed for the sky in the top image and then made an exposure for the building without moving the camera. In Photoshop I opened both and moved the lighter image onto the darker one. I then erased the sky in the top (lighter) image leaving just the darkened sky and the light building.
I suppose that it is possible to get the same results using film, but I don't think it can be done in 15 minutes. If you have an example of this process done in film, I am sure many folks would like to see it.
As for advertising appearing in the sky, so be it... they pay me enough to allow that. :)
More a demo of photoshop than a digital camera - the D1x just gets you there quicker. Very well done. I imagine they filled your beautiful sky with copy... "0% Financing! No payments until January 2003!!!"