Several months back my father passed away and while cleaning out his place, we came across thousands of aerial photographs of BC. Most of them from the 1940's and 1950's. I've always had a fascination with vintage photos, so I started scanning them and putting them on a web site.
There are several shots of Nanaimo in the collection. I just finished scanned the first one, it's available here: http://vintageairphotos.com/55-7/
I've been trying to post a new photo every few days. Be sure to actually click on the images, you'll be able to zoom way in and see a lot more detail.