[Mailman-Developers] 2.1b2-production ready?

How unready for production use is 2.1b2? I've written a Handler module for mailman, that I wanted to use to filter things coming into the archive, but I can't find where to put the call to the handler in 2.0. I don't want it in the pipeline because it should only act on the archived messages, not the ones sent out. Any hints on where this should go? How far away is a 2.1 release?

TIA, Laurence