I was there a few weeks ago, didn't have any trouble but can see how you might miss it. As you can see from carole's picture, the sign is a couple meters away from the actual branching, which is atop that rock in the background. It would be even easier to miss them both when coming from the South, since the trail starts waist-high up on that rock, heading southish at first, and the sign faces ever-so-slightly northward (but doesn't obtrude at all), so in each case you almost have to look back over your shoulder while heading north. From either direction it's fairly clear when you're getting near the summit - just keep your eyes open once you've climbed the 200ft or so from the col. Don't miss the chance to visit Mt Davis, the views are great.
Edit: just saw Tom R's post. The sign (a sign) was definitely there on Aug 25, 2005.