[Dovecot] Which Dovecot version most stable?

I've been testing Dovecot 1.0 alpha1 on Solaris 9 using maildirs and I haven't seen any major issues yet. However, I want to use Dovecot on a production mail server. I'd like to know which version of Dovecot is most stable for this application. I'd also like to know when the next stable release will be available and if it isn't too far in the future if I should wait for a future release before going production.