[Dovecot] Dsync clustering

[list at airstreamcomm.net]

I have not seen mention of using dsync for clustering Dovecot in some 
time on the mailing list, but I believe Timo was going to write a wiki 
page when v2.2 became more mature.  Does this documentation exist yet, 
or are there any resources on what dsync replication is capable of at 
this point (looking on the wiki and google didn't reveal much)?  Thank 
in advance.