Looking back one, two and five years ago today (give or take a day) on Worldchanging:

2009
Funding Grassroots Solutions: Creating Skunkworks for Local Innovation
Grassroots innovation can be an incredibly effective strategy for building community systems that are useful, lasting and resilient. The power of local innovators is their ability to focus on what’s do-able today, with resources available right in the community. Given the right support, a network of community innovators could serve as a global skunkworks, with those closest to the ground generating, testing, and sharing new ideas for solving what may seem like intractable social problems. The biggest challenge, however, is figuring out how to take a lot of great little ideas to a bigger scale...

2008

2005
Greens in Space, Part II
James Cascio follows up his 2004 essay with a look at the increasing privatization of space exploration and how worldchangers can take advantage of this change...

Other recent "look backs":
June 1
June 2
June 3