PBS
Content: Education, arts, and news TV
Cost: Free
Platforms: Kindle Fire, iPad/iPhone, Roku, and the web
For more educational or thoughtful programming, PBS has unleashed its tremendous archive of high-quality programming for free streaming. The full list of available shows is far too long to list here, but some highlights include educational shows (American Experience and NOVA), news (Newshour and Frontline), music (Austin City Limits), and classic PBS series (Antiques Roadshow and This Old House). You can watch on the web, stream to your mobile device, or, with Roku's set-top boxes, enjoy PBS' video library on your TV, where it is available in whatever HD standard your Roku supports.