Sunlight Labs, one of my new favorite data groups, has partnered with Google, RedHat, Mozilla, and several others to get the open source community involved in open government projects. They're calling it the Great American Hackathon and it's happening December 12-13.
For those unfamiliar with Sunlight, it's an organization that promotes open government data and transparency, and they fund technology projects (mainly online apps) that move this idea forward.
Organize an Event
If you're a developer or designer and want to help out, organize an event in your local area for December 12-13, and get as many people involved as you can. The more we make use of open government data, the more people that will see its usefulness, and the more people that care, the more the government will put into data. Get involved now.