Well I've gone and beaten the Umbraco guys to RC1, although I'm sure v4 RC1 is just around the corner. But, none the less I'm happy to have RC1 of the UIL ready for download. There's actually very little changed between Beta 1 and RC1. There's a little bit of a code clean up, and I've addressed a bug which was found by a colleague of mine. She found that if you didn't generate all the Doc Types an exception was thrown if you'd omitted a Doc Type which was a child relation of anyother.