On two separate systems (one 6.0 and one 6.1) the only time I can get lpd
to print anything, is if the job is in the queue and I restart lpd.  If
two jobs are in the queue, they both print.  However, the next print
request is rejected:

lpr: connect: Connection refused
jobs queued, but cannot start daemon.

I upgraded to the rawhide packages:
  rhs-printfilters-1.58-1.i386.rpm
  lpr-0.47-1.i386.rpm

and have:
  alias parport_lowlevel parport_pc

in /etc/conf.modules.

After the print job is rejected, there are still 2 lpd processes running.
The listing from lsmod doesn't seem to have changed either:

Module                  Size  Used by
parport_pc              5012   0  (autoclean)
parport                 7092   0  (autoclean) [parport_pc]
autofs                  9028   1  (autoclean)
nfs                    29944   5  (autoclean)
nfsd                  150936   8  (autoclean)
lockd                  30856   1  (autoclean) [nfs nfsd]
sunrpc                 52356   1  (autoclean) [nfs nfsd lockd]
3c59x                  18920   1  (autoclean)
nls_iso8859-1           2020   1  (autoclean)
nls_cp437               3548   1  (autoclean)
vfat                   11516   1  (autoclean)
fat                    25664   1  (autoclean) [vfat]
opl3                   11208   0
sb                     33204   0
uart401                 5968   0  [sb]
sound                  57208   0  [opl3 sb uart401]
soundlow                 300   0  [sound]
soundcore               2372   6  [sb sound]

That's about all I can think of to check.

-R