I found this from Metascene;
it's the Columbia Journalism Review Who Owns What.

It's a facinating read... at least for me.

I, for example, didn't know that Sir Conrad Black has newspaper interests in Chicago.

other things I've learned
(and remembered)

Washington Post owns the television station from which I watch Jeopardy (owned by sony). And it also owns Newsweak.

Time-Warner owns my fave, Rhino Records (sigh) among many other little labels like Nonesuch and Maverick. On that note, Disney owns Jane magazine and Mammoth Records. And I forgot what a beomoth Seagram is in the music industry.

Maximum Rock and Roll produced a lovely factsheet some years ago that illustrated how there are really only six major forces in the music industry. Does anyone know whether it has been updated?