I updated to the latest dovecot release last night, and I think that that killed geeklair.net (many times) today.
I've updated it with the HFS+ avoid hardlinks patch (from darwinports) and I _think_ it will be ok now. This patch is being considered for inclusion in the next dovecot 1.0rc release (8).
Also, since sendmail has developed an annoying habit of not logging to syslog() after a little while (sending sendmail SIGHUP makes it log again for a few minutes, but the problem always comes back), I've finally switched MTAs.
geeklair.net is now running postfix. I think everything is working, but I'm sure I could have missed something.
Let me know if you notice any issues/problems.