Purple Haze is a type of beer brewed by Abita, a small brewery in southeastern Louisiana. Purple Haze is an "American style" wheat beer that has raspberries added to it during secondary fermentation, hence the "purple."
It tastes a bit fruity, and somewhat tart (until after you've had more than two or three...), though it is unmistakably beer, in spite of its fruity taste.
Purple Haze, and all other Abita beers, are brewed in Abita Springs, Louisiana, and take their base waters from the natural spring there.
In my opinion, there's nothing special about this stuff. The infusion of raspberries gives it a queer, not quite fruity taste that doesn't exactly leave you wanting more. It has a very bitter aftertaste, more than most unflavoured beers have.