Euan Semple's talking about how he developed social software at the BBC. It's nicely put. And I think the metaphor carries way beyond software.

When we started building this stuff at the BBC we were consciously trying to build the online equivalent of a collection of Cotswold villages with lots of footpaths between them. You know where the pub and church are, you’re comfortable in the environment and you can locate yourself. Corporate systems tend to be more like Milton Keynes. On the surface they’re efficient with lots of straight lines and signposting, but you get lost because everything looks the same.