Yahoo Pipes is going away on September 30.
If you have used Yahoo Pipes to create alphabetical or chronological lists of blog posts, you have only a few days to preserve those lists by converting them to HTML.
(If so, you know who you are. Everyone else can just ignore this message.)
The HTML solution is not as good as the Pipes-based list it replaces. but for now it is probably the best option to keep what you've already made.