Steve,
Tomorrow is the first day of Internet Identity Workshop (where I suspect a number of DP folks may be). Though it doesn't begin until 8:30AM PT, I have a breakfast beforehand (as is typical for this week), so I may or may not be able to dial in for part of this call.
Sorry for the constant stream of conflicts. In case I can't make the call, please pass on the news that I met with the MyDex folks in London two weeks ago and they are getting very close to their first implementation -- for a UK government agency -- of user-driven COA (change of address) based on a user's MyDex portable data sharing account. This implementation will use both Information Cards (for the initial authorization) and XDI (for the updates).
=Drummond