It looks like it was shot with a slow shutter, maybe an ND and or polarizer filter. RAW mentioned in the description makes me think it's been tone mapped in photomatix or some similar HDR program that gives a lot of control of color saturation. Very likely a multi image HDR.
There is a book on HDR that has a lot of shots like that called Complete Guide to High Dynamic Range Digital Photography by Ferrell McCollough. It's about $15 on amazon and worth the money if you are interested in that type of thing. I just got it a recently and I'm working my way through it now.
I've done very few sunset HDR shots but the few I have done have a similar look. I'm sure that took a lot of fiddling..
One of my HDR sunsets
HERE and one more
HERE.