I just went through the PR database for macppc and ran across a few 
with could probably be fixed easily enough.

The following have patches - someone with appropriate expertise should 
look at them and apply as necessary:
  - Add support for the ethernet portion of the E100/Mercury board
    found in SuperMac/UMAX S900
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=26340

  - Built-in mc0 ethernet does not work (gives timeout errors) on Apple
    Network Server
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=20608

  - obio.c change for modem power
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=15505

  - some cards in pci1 ( behind a PCI-PCI bridge ) in S900 boxes don't
    get an IRQ assigned
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=26341


The following involve judgement calls, but would be easy to fix (or at 
least close the PR if the decision is to not change anything):
  - SCSI bus numbering from OF is inappropriate
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=10678
    this should be a simple matter of moving mesh before the other 
scsibus devices

  - Mouse does not work
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=10240

  - Cardbus does not attach on Powerbook G3 Wallstreet
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=26508

  - serial port naming to avoid confusion
    http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=9509

Thanks!
   -- MW