Axil Comras of Green Home points us to PlaNetwork, a conference June 5-6 in San Francisco on technology and social change. Presenters from MoveOn, the Dean Campaign, LinkedIn, and dozens of other outfits will discuss timely topics like e-voting, social networking, and grassroots digital activism. At $100 per day, it’s not cheap. However, if you get three other people to list you as the referral when they pay, you get in free. So do a bit of pre-planning with three friends and all four of you can cut 25 percent off the admission cost! Link