I couldn't help but do some cross pollinating for once (or is it cross blogginating). I've just read and reviewed "Groundswell" by Li & Bernoff.
The book is about how people use social media to buck the trend of how they get information - namely using technology rather than the traditional methods from traditional instititions. This has significant implications for how we go about encouraging the spread of good practice.
Read the book review and get more infomration at www.mybookblurb.blogspot.com