So much has changed since RC2, it makes RC2 look like a beta. 🙂
I’m happy to say that I’m not just a user of Castle projects, but also a contributor (having sent in a few patches related to the Castle Validator).
With RC3’s features and stability, and a nice easy Windows installer available on SourceForge, there’s no excuse for you not to start exploring the power that the Castle Project libraries can bring you.