I like Mike Bender's approach, which I think is derived from Homer's golfing machine not sure though. Imagine a straight line from top-of-swing hand position to the ball (or a little in front of it). On your downswing, make your hands follow this path, fast, into follow through. Of course they don't actually travel in a straight line, but it promotes holding lag, and bringing hands (or club handle) in front of the ball for impact, which of course eliminates flipping.
I highly reccommend his book, and swing. I've read them all, and in my opinion this is one of the best explanations of a great swing that's easy to learn, and more importantly, repeat.
http://www.mikebender.com/Book-Build-the-Swing-of-a-Lifetime.html
And no, I'm not affiliated, just flabbergasted at how his methods described in the book changed my swing for the better, literally overnight. I never flip now, and I gained 15 yards easy on every club. I just turned my buddy on to it a week ago, and he's already seeing huge improvements with his swing and consistency.