Yesterday the City of Edmonton's IT branch launched the initial release of its Open Data Catalogue at data.edmonton.ca. The catalogue is in a "community preview" phase, which means that the City may make breaking changes. Currently there are 12 data sets available to developers, from the locations of historical buildings to upcoming road closures.
The catalogue runs on Microsoft's Open Government Data Initiative (OGDI) platform, an open source project that runs in the cloud atop Windows Azure. Edmonton is the first municipality in North America to deploy OGDI.
Congrats to the City of Edmonton on bringing open data to Edmonton!
You can read more in my post Open Data comes to Edmonton.