If you search the local blogosphere you will find posts that chronicle the history of Ottawa. One blog that is worth reading is GlebeSite, which focuses on the urban design, architecture and history of the Glebe neighbourhood. A recent post contains a history of the Ordnance Lands, while another has pictures of the area just south of the Glebe before Carleton University and the Bronson Avenue Expressway were built.
The blog HistoricDalhousieWard also contains hard-to-find information, such as the Ottawa Tech high school graduating class from 1943, and the history of Musca Fruit store on Rochester Street that is being torn down, along with other buildings on the block, to make way for new townhomes.
Urbsite is another good blog for local history enthusiasts. Recents posts include pictures of downtown Ottawa from 1957 and images of Ottawa that date back to the 19th century.