I added Atom support to Really Simple Validation. I also added the FeedValidator.org1000 test cases to the RSV test framework, which is NUnit based. The tests run on my laptop in about 25 minutes. I'm going to spend a couple minutes working on the user interface. Currently it responds w/ an XML document, which I'd like to add an XSLT processor statement too and have it auto-transformed to more pleasant HTML, maybe even XHTML.