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In cookbooks I have, it's primarily used in sauces and in baking. Handy because it can easily be mixed into either wet or dry ingredients in a way that peanut butter can't be.
Edited to add that if you search the forums for "Peanut Butter Powder" you'll find a topic in the baking and pastry area with a few posts, Peanut Butter Powder and other posts by members using it in different ways, like @mgaretz in ice creams or frozen desserts and quite a few using it in candymaking.
In cookbooks I have, it's primarily used in sauces and in baking. Handy because it can easily be mixed into either wet or dry ingredients in a way that peanut butter can't be.
