This is probably boring. But Mark Pilgrim and friend came out with the latest and greatest little tool: Feed Validator for Atom and RSS.
What does it do? It allows owners of sites like Deckchairs to make sure website content is readable by RSS readers/browsers. Who cares? Well, it sure seems that everyone will once RSS truly catches on and it looks like it is. Here’s an important post by JK about little old it. Does Deckchairs validate? Yes, it does which means something.