Great work on this upgrade/rewrite. It's good stuff. However...(you knew there would be a "however"...) Captcha doesn't seem to work in Safari (mac). I'm running Safari 2.0.4 (not the beta) and captcha fails usually. The error I get is: Captcha token test failed
I've also had one instance of someone using Firefox having it fail...so maybe it's not Safari. It's the same ol' thing, though...if you try a few times, it eventually works, but usually not the first time.
I don't have much info to give you on what's wrong...just thought I'd share my experience.