I've been looking at validator for a week or so since my RL job now requires me to support it. To that end I'd like to help out. Eventually I'd want to look closely at JSR 303, especially having annotations for fields and methods, but for the current work I'm happy to help out on the 1.4 port and refactoring. Niall, assuming you're still the leading hand on this, can you let me know where I'd be most useful to start with? In the meantime I'm going to poke through the code.
--Ben