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MyStack.com lets you create "Stacks" - like the one you see on the right-hand side of the page. A stack is a list of links, like a blogroll, and can be inserted into a weblog or webpage. Unlike ordinary blogrolls, the list of links in a Stack changes. When you create a stack, you tell us what items you want us to stack for you. When the PubSub system finds new items that match your request, your Stack is immediately updated.