For the record and the archives, this is the solution that seems to work
for using procmail with default delivery to ~/Maildir/ *after* processing
recipes.
1. You can use ~/.procmailrc with the last recipe being
DEFAULT=$HOME/Maildir/new/.
:0
$DEFAULT
(note this must come after all recipes have been processed).
This solution works but does not leave those wonderfully unique file
names like Qmail normally would delivery.
2. You can use http://www.ucalgary.ca/~nascheme/maildir.c
as your last procmail recipe as follows
:0
|maildir $HOME/Maildir
This is definitely my preferred solution.
And lastly for the record, the ~/.qmail file should look like
|/path/to/preline /path/to/procmail