My wife is a big Black Friday shopper. We do a bit of Xmas shopping for the kids then, too. A good site to see the ads and plan your assault is
www.bfads.net.
I go with mostly to keep her from going too crazy, and most times, she rationalizes herself out of making several purchases. Get them into the cart, and then think about it. My bro got an LCD tv at Best Buy a year ago that was a great deal.