This isn't a peanut alert, but a tree nut alert. But I know a lot of people who are allergic to peanuts are also allergic to tree nuts.
Silk just started making and selling Almond Milk. As a result, their soy milk products now have a "May Contain Almonds and Coconut" warning on the label. I missed it, and I'm sure other people did as well. Thankfully, no one in the house had a noticeable reaction, and we've dumped the soy milk that was in our fridge.