Mozilla (of Firefox web browser fame) makes most of its internal meetings open to the outside world so its vibrant community can participate. Meeting details are shared on the website, and anyone can jump on calls, chats, etc.

While it is not likely that many typical organizations could operate this way and open meetings to the outside world, almost any organization could enable a default to open internal meeting policy. What would this mean? When scheduling conference calls, meetings, etc, the call-in details, web conference login information would be published on-line so that anyone could join. If the host of the meeting deemed the material too sensitive to have the meeting be open to other employees, they could choose to have the meeting closed-- but all meetings would be open by default. Would every meeting be open? No. But defaulting to open would result in more open meetings, more transparency, and more collaboration... not to mention the occasional serendipitous contribution that occurs simply because the meeting itself was made public and someone with a new perspective was able to join.