Open data for the City of Ottawa has a citizens' group and city staff involved.
The citizens' group Open Data Ottawa is having a combination of hands-on learning and hacking on December 8, 2012 at City Hall.
You can also find the citizens' group on Twitter, Facebook, in a blog and via email
As well there is a discussion group and a discussion website that the city monitors
On the city side, there is the portal, an email contact address, mailing list and RSS feed. The transit system also maintains a developers' site and an apps portal.
UPDATE 2012-11-30: For OC Transpo data questions and issues, please contact OCopendata@ottawa.ca ENDUPDATE
Transit Agency (OC Transpo)
The city has run one apps contest and there will be a second in 2013.
Let it not be said that info isn't pushed out into a lot of channels.
May 25, 2012 Ottawa Transit Data Day - June 2, 2012