With version control under code and content, you can open access to more people. For example, don't require people to go through a lengthy process or to "prove" themselves with X number of patches. Give people access to whatever they need to make a difference, even if they don't use the access.
Wikipedia is a prime example here. They use the power of the community size to police bad content changes, rather than limiting the community size behind rules of what it takes to write content changes.
