The UK government is using a simple online webpage to gather ideas on how to save money. It is called the Spending Challenge. You can input your idea, some words about how it can be implemented, add a tag or two and then post it. You can read through others' ideas, add tags and ratings. The system allows you to search by tag, new ideas, most commented or highest rated.
This is crowdsourcing at its most pragmatic. I doubt they spent more than £1000 setting up the system. The addition of a rating system gives it power and meaning. Especially as anyone can rate any idea - not just those in power.
In the same month this is launched I've worked with a variety of public sector teams who range from denying the existence of technology, denying they have permission to use anything remotely interfacing the public (or their staff) unless there are controls, or want to create their own thing. Probably worse, some are still working at the level of theory and concept for social movements, mobilisation and networking, running workshops and developing programmes to spread the word of change. By the time they've spent a fortune on their programme, a huge part of the UK population will have been mobilised using simple techniques such as this Spending Challenge one.
I feel that so often we get lost in the theory and concepts, and the need to develop eloquent (and controllable) solutions, that we overlook the most simple mechanisms, complemented with speed and pragmatism.
Well done HM Treasury for getting the Spending Challenge social movement underway.