I've done a lot of experimenting and don't mind sharing what I find works. These were all taken with a Canon D20 and Tamron 17-35 lens on a tri-pod with remote switch. Here are the general parameters I used for these, but let me know if you want specifics for a particular shot.
- ISO-100 (I never comprise here for sunset shots)
- Apeture between F11 and F13 (using AV mode; with TV mode you'll really struggle with the changing light). Anything much lower than F8 and I find I just don't have the same sharpness and DOF.
- Shutter speeds range from 1/8-1/13 for these shots (but could be even slower for interesting effects with the water). I don't really pay much attention to the shutter speed as I know it will be slow.
- Post processing in CS2. Mostly messing with Curves and Shadow/Highlights. I also bump the saturation up10-15 and then do Smart Sharpen to 30-50 depending on the shot. I sometimes add a touch more Red/Yellow in color balance if the image comes out too cold, but the 1st shot above I didn't mess with the colors at all. The last one I did.
I'm just an ameteur so if any of you have any other tips to add (or feel I'm off on something), please jump in. This is what I found works for me.

~ Canon EF 70-200mm f/4L USM ~ Canon EF 100mm f/2.8 Macro ~ Tokina 12-24mm f/4 AF DX ~ Canon 100-400mm f/4.5-5.6L IS USM
