This Thursday, the PdF Network conference call will feature an in-depth conversation with Jacob Colker on the topic of "Mobile Volunteers: How to Harness Microvolunteering for Your Cause." Click here to RSVP. Colker is the co-founder and CTO of the Extraordinaries, an amazing nonprofit start-up that is in the middle of building a dynamic platform that is enabling all kinds of good causes to tap into the unused free time of potential volunteers with mobile phones. This is the cutting edge of a larger trend that many people call "crowd-sourcing," but microvolunteering is more structured and aimed at producing social benefits. As I wrote a few weeks ago, While they're still mostly under the radar, there's enough going on now, in...