After finding some spots with running water and (very) minor waterfalls in easy driving distance of my home, I ordered my first ever ND filter.
Thanks to ISO100, f16, an ND8 filter and a linear polarizer I was able to stretch exposure on this river scene out to a very nice 30 seconds despite it being taken at 12:37....practically high noon.
Pentax K20D
S-M-C Takumar 35/3.5
I found the Live View to be an extremely valuable aid in setting up this sort of shot today. I must admit that it is a use for Live View that I never would have foreseen.