I'd disagree with underexposing sunsets  (but i'd agree with the qualifier that otherwise you have to work on it in post processing - yes you get the colours and all, but you are sacrificing other parts of the image).  You need all the dynamic range you can get to get the colours and detail in the darks (unless you are going for a silhouetted sunset - in which case underexpose to your heart's content).

The sunrise photo below was exposed to the right (and even on the camera it said it was blown).  But you can see that is not the case in the processed version (maybe one or two parts in the clouds, but not the white the camera screen told me i took), and i have kept detail in what would normally have been just a mass of black (the foreground trees for example).  The camera (even when shooting RAW) apparently already gives the RAW file a contrast boost, meaning that what you see on the screen is skewed towards being blown and darkened so you dont really know what you actually took and what detail is there in the high andlow ends until you get it on your computer and process it.

http://www.renderosity.com/mod/gallery/index.php?image_id=2044316&user_id=409068&np&np

How did i do it? Luminosity masks (very simple once you get the hang of them) Go read this tutorial from Tony Kuyper:

http://goodlight.us/writing/luminositymasks/luminositymasks-1.html

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography