> Anyone successfully have mailman and mhonarc setup?
> Any info about doing it would be appreciated.

Yup, but it's a hack.  The longterm goal is to patch mailman
to allow *any* outside archival program to be executed instead
of pipermail, but for now I just subscribe an archiving 
account to the mailing list.

The archiving account can be alias that pumps things directly
into mhonarc, or you can use procmail (as I do) to send the
incoming messages to mhonarc with appropriate commandline
arguments.

The final thing that I do is comment out mention of the archives
from $prefix/Mailman/Cgi/admin.py (lines 40 and 41 in 1.0rc1) and
the sections in $prefix/Mailman/MailList.py.  I also change
PUBLIC_ARCHIVE_URL and PRIVATE_ARCHIVE_URL to point to the 
URL that the MHonArc-based archives are in.

Chris