I thought this project was pretty interesting because it relates to some discussion that has appeared in this forum:
http://www.densecity.ca/
Specifically, the question of what to do with stable neighbourhoods of single-family dwellings comes up. I think this, combined with larger-scale development on empty lots, is a great approach.
There's a related site with blog and some restoration projects:
http://urbanrenewable.com/
The page also has this map of population density in Halifax:
This is much more meaningful than a census tract density map where industrial areas and parks are merged in with developed residential blocks. It looks like university residences aren't counted though (they are pretty significant -- Dal alone has over 2,000 rooms for students). It would be interesting to see a map incorporating the full student population as well as employment density.