You might have to try different things and see what he responds to. I had tried every approach I could think of, but nothing worked (all sorts of verbal correction, redirection, time-out, etc). Now what I do is take his hands and gently put them down by his sides and just hold hold them there while I repeat "no hitting". It isolates the behavior by drawing his attention to his hands, and it really gets his attention - he dislikes it, but it's not mean and scary. He rarely hits now.
at 8:09 AM on Mar. 3, 2009