My original comment still holds true. I know that panning makes composition quite a bit more difficult as well. I have tried and failed for the most part :) I think you picked a perfect shutter speed for this photo. The background and surface are both blurred nicely without going overboard. I have found that 1/60 and 1/30 both work nicely for shots of this nature.
I would also comment that this photo could possibly use a minor level adjustment to darken it just a tad...
Excellent pan. I have made a few comments of this nature today, but I believe that opening up some space in front of this boat could create a higher impact photo. Filling the frame is usually a good idea, but when motion is involved, it changes things a bit. = 6
Good panning technique, nice and sharp. The composition doesn't do much for me though, I think more negative space is needed... maybe for the boat to enter into. The colours seem a little flat.