New wiki on this subject looks worth a look:

Welcome to the “user contribution system on user contribution systems.”  My hope is that this site becomes the authoritative aggregation of knowledge and how-tos on how organizations create, foster, and benefit from user contribution systems (UCS)…because of the knowledge and experience contributed by contributors like you.

Related posts:

1. Revolution 2.0 is coming soon to a store near you
2. The shoeless revolution
3. Valuing self-knowledge
4. A Manifesto for the Next Industrial Revolution