The Curriki site, funded by Sun Microsystems' Scott McNealy, looks very interesting and appears to have the financial base to pull it off. It is a Wiki/repository.
From the site:
“The Curriki site "is an ever-growing collection of free lessons, assessments, resources and textbooks," as the home page states. "The resources have all been developed by members of the Curriki community." Like Wikipedia, Curriki members will be able to comment on and edit the materials on the site.”
See http://www.curriki.org/xwiki/bin/view/Main/