We've finalized the report on the survey we did early last month. There are some interesting results, and it is worth a read. The summary:

Our sampling wasn't sufficient to allow us to draw firm conclusions about software choices in the nonprofit sector as a whole, but our responses did come from a broad range of organizations. These groups are diverse both in size, mission and their use of free and open source software, and it is clear from their responses that FOSS is actively used in the nonprofit sector. FOSS is common on web servers, and while FOSS desktop operating systems are still uncommon, many nonprofits use free and open source applications on proprietary desktop operating systems. Many people in the sector use FOSS everyday, or at least quite frequently. Nonprofits do have a clear understanding of the strengths of FOSS, and at least some organizations have made organizational commitments to open source and open standards.

Read it here.