We've been adding images of Campbelltown from our collection to Historypin. This website allows these photos to be linked to their locations on google maps. A clever feature of Historypin is being able to fade out of the photo of the past and in to the contemporary street-view.
To have a look at Campbelltown Library's channel go to http://www.historypin.com/channels/view/16333020/#|photos/list/
It's a fascinating way of comparing images from yesteryear to the same scene today.