Since there seems to be interest in Japanese cookbook reviews, I will be posting some here periodically!
The question is, where is the best place to shop for Japanese books, magazines, DVDs and such? If you have a Japanese bookstore near you, that's the best place. One tip for buying magazines: the most recent issue of any magazine has been airmailed to the store, so the price you'll be charged is for the cost of the magazine plus that airmail cost. However, if there are any issues left after a month, the stores may sell them for a discount. (Kinokuniya in New York and San Francisco both do this.) Since most food magazines are not that timely, this works out well.
If you don't have a Japanese bookstore near you, the two biggest and most user-friendly online bookstores for Japanese language material are Yes Asia and Amazon Japan. I've bought stuff from both, and in terms of customer service and so on both are pretty good.