Just came across some recently posted photos on the OPENSFHistory site: http://opensfhistory.org/Update/
Be sure to click on the link to "Batch Dates" for the latest additions--more than 1,300 new images posted in just the last 3 weeks. You can also sort the photos by neighborhood and by year. This will keep me occupied for most of the day!
Thanks again to all the WNP volunteers for their efforts in scanning this large collection, one image at a time.