I just came across the site for our borough's own historian. The Staten Island Historian, is an unpaid post that was occupied by the late Dick Dickerson for many years. The new man, Tom Matteo, has got a nifty website going but it left me a little disappointed. He's got the same NYPL Digital Collection links I've got but he doesn't offer any additional information. One of the drawbacks of the NYPL's collection is that there's too little detail about the pictures. Too many give little real indication of their locations and dates. I was hoping the Borough Historian would have access to information the rest of us don't.
Nonetheless, there's plenty of great stuff on the page and it does bring the NYPL pictures together by easily searchable categories (ex. churches, schools, etc.). Definitely worth examining.