OpenAddresses was presented at NSGIC (http://www.nsgic.org/events/2010_conference.cfm, the program: http://www.nsgic.org/events/2010conference/2010onsite_program08-20-10.pdf, p. 16) last week.
I got the following feedback from Learon Dalby who did the presentation:
"Presentation went well. OA was a portion of the presentation. Key likes were that there really isn't any overhead. A user just provides the data and it is added.
There was a lot of interest in being able to subscribe to changes. For example: Arkansas provides you a data set, another user edits or adds data in Arkansas, how could that edit/addition be communicated back to Arkansas?"