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I'm sure if you search the arcives you will find it, but there was a study done that found that the higher pressure improved stopping at least on wet pavement because the harder tire displaced water better then a soft tire, the smaller contact area also meant that it wasn't trying to displace water from as large of an area.
A lot of snow tires are rated for 51psi, my summer tires are rated for 44psi and when I bought my car 30,000 miles ago it had 44psi in the tires and I've kept them that way, they are nearing the end of their life and the wear is dead even.
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