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One of the biggest complaints that my wife has when we ride is when she slides forward under hard braking or hitting bumps.
I cruised a few firums and came up with somethig pretty cool. It's called a Triboseat. (www.triboseat.com) It's basically made of the same rubbery/sticky stuff that you put under an area rug to stop it sliding on a bare floor. It's custom cut to the size of your specific seat and has a drawstring to get it tight on your seat.
Here's a photo of how it looks after installation:
I think it works out pretty well with the Corbin saddle I have.