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Here's a link to a page where you can download the complete text of the 2002 World Development Report, which includes the chapter on the media:
http://tinyurl.com/5nh2o9
(I've never used Tinyurl before so let me know if this works!)
That page also has links to the consultations and background papers, which are also very useful. There's also a lot of media-related stuff on the WB site, incl things about media law and regulation, media role in development, etc. The top level page for the search I did on media ownership is:
http://extsearch.worldbank.org/servlet/SiteSearchServlet?qUrl=&ed=&q=media+ownership
If you're in a position to put your research in front of anybody, be warned that in DC they will roll their eyes when you mention the world bank ... but once you know what you're looking for, you can find corroborating reports on USAID's site (in addition to media, you might want to search on Internews and IREX, two groups that do a lot of USAID-funded media work ... and whose program reports are available there).
Hope that helps!