Setup: 02-May-2012 
The Topic Details tab of this Topic lists pages of community stakeholders, in summary and detail. There's also a portal into many of their websites.
We tracked park groups on the "Stakeholders" list used by Parks Forestry and Recreation, with the help of Google, as well as the PFR "Partnerships" list, the Toronto Parks People list, and others. There are two "list of contacts" tables with web links and contacts. Each group in the tables has a "more info" link connecting to a digest of the information we found. We e-mailed the groups on the stakeholder list and whenever they sent us clarifications we added them. We welcome additional information: mail@publiccommons, and are happy to be able to make this list available to everyone who might find it useful: List
Here's City's original Stakeholders list