MyStack.com lets you create "Stacks". 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.
We currently support two types of Stacks:
LinkStacks - Stacks of items in RSS feeds and newsgroups that link to a particular URI (like your favorite website, or your blog); and
TopicStacks - Stacks of items in RSS feeds and newsgroups that mention some keywords or phrases

