Public collaboration, network effects, crowdsourcing - call it what you will, the read/write web is based largely on projects where the value of the whole is greater than the sum of countless parts. Those parts are contributed by individual people all over the world, often for free. It's world-changing stuff, but can businesses make effective use of this paradigm?
The web is proving to be quite disruptive of all kinds of old approaches to doing business, but there's still a shortage of case studies when it comes to new paradigms like crowdsourcing. Ramachandran's list doesn't include any evaluation of the various programs' effectiveness yet, but it's a great place to start. The big list is