I know a lot of organizations have been successful by reframing their inservices as "community meetings," and conducting them in a truly egalitarian manner.  

Are you familiar with the concept of "learning circles?"  

The folks over at the Culture Change Now website have some great resources on how to create a high involvement organization.  They have a feature called, "Ask Pact" and listed there is a helpful comment by Nancy Fox, the Executive Director of the Eden Alternative.  She points to a document that lists Ten Ways to Create Involvement (opens as a .pdf file), created by Action Pact for Eden Alternative trainings.