Our guide to (mostly free) sites you might find useful
Advanced Television (Broadcast-streaming-tech)
Advertising Age (US advertising)
Andy Cowles (Mag-media creativity)
Association for International Broadcasting
Benedict Evans (Silicon Valley guru)
David Hepworth (Mags, music, media)
The What & The Why (Foreign policy by Tim Marshall)
The Guardian Media (Mainly UK)
Mashable (Global media-tech-business-culture)
Monocole (The Stack podcast on magazines)
Professional Publishers Association (UK magazine-media)
Reuters Institute (Journalism research)
Shatzkin Files (US book publishing)