I don’t know if it is relevant but HEFCE’s Joint Information Systems Committee(JISC) has just put out a call for projects to create innovative Open Educational Resources (OERs) around the theme of World War One.
See http://www.jisc.ac.uk/fundingopportunities/funding_calls/2011/10/grantcall1711.aspx for details. I know Wikimedia wouldn’t be eligible but might be in a position to collaborate?