By Paul G. West and Lorraine Victor, prepared for The William and Flora Hewlett Foundation, May 2011. This paper appears to be an excellent resource for collections of OER, both in the US and around the world.
By Kim Parker, Amanda Lenhart and Kathleen Moore, published by the Pew Research Center/Pew Social & Demographic Trends, August 28, 2011. The big take-away seems to be that 51% of college presidents surveyed find that "online courses offer an equal educational value compared with courses taken in a classroom," but only 29% of the general public agrees with this statement.
Announcement of a Summary Report produced by Community College Research Center (CCRC) by Davis Jenkins, Shanna Smith Jaggars & Josipa Roksa, November 2009. The analysis looked at the Virginia Community College System (VCCS), studying a dataset of 24,140 first-time college students who enrolled in at least one VCCS course in summer or fall 2004. A PDF of the summary is available from this page, as is a link to the full-length technical version.