I've found a huge encouragement from the dialog between Bill Gates and President Bill Clinton at the 2008 Clinton Global Initiative about the critical part that sharing positive outcomes plays in engaging modest donors - and therefore a sustainability factor of the project. See: http://www.intelligentnetware.com/ProjectsTools/HippoNexusPositiveOutcomes/tabid/71/Default.aspx

It is imperative that Enterprise Facilitation stories are told - do good work and tell the story. Funders will be looking for evidence that their money has received a reasonable return on investment. Also, storytelling builds the believability factor for the service itself, attracting new users. Some communities are exceptional at telling their stories, others not so much. Those that do have strong MARKETING function somewhere within the service (host organization, volunteer). Without MARKETING represented by a passionate person, do not expect the service to enjoy a long life time.