According to Wikipedia:
Time Warner Cable owns these networks:
New Line Cinema, Time Inc., HBO, Turner Broadcasting System, The CW Television Network, TheWB.com, Warner Bros., Kids' WB, Cartoon Network, Boomerang, Adult Swim, CNN, DC Comics, Warner Bros. Animation, Cartoon Network Studios, Hanna-Barbera, and Castle Rock Entertainment.
CBS Corporation owns:
Showtime, part of the CW (with TWC), and all the CBS programing.
Discovery Communications owns:
28 network entertainment brands, including Discovery Channel, Military Channel, TLC, Animal Planet, Discovery Fit & Health and a family of digital channels. DCI also distributes BBC America and BBC World News.
The Walt Disney Company owns:
ABC broadcast television network, Disney Channel, ESPN, A+E Networks, LifeTime.
Scripps Networks Interactive owns:
Food Network, DIY Network, Cooking Channel, Travel Channel and Great American Country
Viacom Media Networks owns:
MTV, VH1, CMT, Nickelodeon, Comedy Central, TV Land, Spike, Epix, Blink.
Fox owns:
Fox channels
NBC owns:
NBC channels
It's nice to see that these conglomerates are not all that conglomerated. The networks that will allow themselves to be internet subscription based will be the ones with the most to gain.