It is 30% off everything in the store except gift certificates and cafe items. I purchased 3 PS2s and a bunch of games.
The bizarre thing is that, despite all the signage about 30% off for Amex Blue and the fact that every cash register has a special amex chip reader and video display, that the 30% doesn't come off automatically, but rather the cashier uses a calculator and deducts 30% from the total after it is rung.
The hot deal is Dec. 26th, when you can combine the 30% off with the coupons. The coupons say that they cannot be combined with other coupons, but nothing about the Amex deal.
Given my spending today, I'm sitting here with 13 coupon books. December 26th is going to be a good day for me. I'm seeing lots of music, some new headphones, games, and maybe a Philips MP3 player.