For me, the benefit of separating open data and open government is to leverage some of the value of the open government movement without getting it bogged down in more complex issues. It's just a way of making a differentiation.
To me, these definitions are very fluid, so it's difficult to know exactly what they actually mean, except in common parlance. When people talk about open government, it's in relation to people wanting to know what government is doing and how they can get involved in that. That is infinitely more problematic than releasing data that government has collected, data that could be used for commercial value but that has absolutely no privacy implication at all.
I think it's a useful differentiation because it allows us to make progress on certain fronts without getting bogged down on the ones that are more difficult.
I talked about businesses that can be created using open data, but there's also another metric of looking at it. Maybe in austere government times there might be an opportunity to provide a little bit less government service, so that instead of government being the only utilizer of that data in providing service to citizens, the private sector perhaps could do some of that work.
Value can be created there in government efficiency by not thinking of government solely as the collectors of data and as the only ones that can use it, and thinking that this is the service that government will provide. Instead, they could collect the data and give it to somebody else. Someone else can provide that service so that they don't have to do it. They won't do it unless it's a service that's not being done effectively or efficiently by someone in the private sector.