Okay, found it: 
To others who have the same problem, if you're trying to sort folders by
subdirectory's of your Maildir Inbox, those subfolders start with a dot

so the PLUG folder is actually ~/Maildir/.PLUG
and then your ~/procmailrc file would be: 

MAILDIR=$HOME/Maildir/
LOGFILE=$HOME/procmail.log

:0:
* ^To:.*plug-discuss@lists.plug.phoenix.az.us
.PLUG/


the leading dot and the trialing / are imortant!

with a .qmail file of 

| /usr/sbin/qmail-procmail 




On Wed, 2003-06-11 at 11:52, Liberty Young wrote:
> I don't think that's it. 
> If i don't have my .qmail file, then mail is delivered just fine; 
> incoming mail gets put into my Maildir folder. 
> However, if procmail get's involved, procmail is putting it into the
> /var/mail directory, which is wrong. 
> 
> 
> On Wed, 2003-06-11 at 12:49, Mike Starke wrote:
> > On Wed, Jun 11, 2003 at 11:30:35AM -0700, Liberty Young wrote:
> > /_I'm trying out procmail and qmail under Debian. 
> > /_I can't get procmail to behave correctly with Maildir. 
> > /_
> > /_I have in ~/.qmail 
> > /_| /usr/sbin/qmail-procmail 
> > /_
> > /_and in ~/.procmail 
> > /_
> > /_MAILDIR=$HOME/Maildir/
> > /_LOGFILE=$HOME/procmail.log
> > /_
> > /_:0:
> > /_* ^To:.*plug-discuss@lists.plug.phoenix.az.us
> > /_PLUG/
> > /_
> > /_
> > /_However, procmail still delivers messages to /var/mail/grimiore, which
> > /_is a file, not a directory. I'm wanting it to deliver it to the PLUG
> > /_folder in my user's Maildir folder. 
> > /_
> > /_Any ideas? 
> > 
> > In addition to my last post, in Debian, you may want to
> > take a peek into the startup file '/etc/init.d/qmail'.
> > Differant delivery options can be turned on/off right
> > there :-)
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