Quote Originally Posted by MikeK View Post
Long exposure is the way to go, but you also might try long multiple exposures - gives a bit more of a punch to that silky flow.

I believe our Les Maclean has posted some examples of this technique in the past.

I've seen a couple of examples of water done this way, I think by Les and/or Barry Thornton. They do give a sense of motion, and not so "silky". I prefer them myself.