Under "Satellite images of Ottawa" there is a link to City of Ottawa's geoportal
http://apps104.ottawa.ca/emap/It is definitely worth mentioning that they have posted their 2011 imagery of City of Ottawa (and then a bit more). This is very good imagery, and this will be the most up to date you'll see online for Ottawa for the next couple years. I think Google's imagery for Ottawa is 2008, 3 years older. Check it out!