Thanks everyone for the earlier comments. I'm like a kid in a candy store with these ocean sunsets... being land-locked can do that to a person after a while. If you'll indulge me for one more, this is Bodega Bay, California. I used a two-stop hard edge ND grad, plus a variable solid ND filter to control shutter speed. I wanted just enough blur to show the splash motion, without turning it all into mush. 1/3 second did the trick. And once again I used The Photographer's Ephemeris to plan this shot (if you don't already have that software, I'd highly recommend it).