Stan Drapkin, of SecurityDriven.NET fame, was nice enough to provide a little feedback on the Clavis implementation. He pointed out a possible issue with parameter names not being properly URL-encoded, which this release fixes. I also applied a few minor optimizations so generating URLs should be a little faster. I've been using Clavis in production for a couple of years now, so it's fairly stable and user-friendly.
The Clavis wiki and issue tracker are available here.