DVRs have become an indispensable technology for consumers by helping users time-shift their TV and recommend new shows.

ENGADGET: Western Digital refreshes My Book DVR Expander HD

TiVo, of course, pioneered the modern concept of the personal video recorder (PVR), which lets TV viewers "time-shift" when they want to see programs, pause live TV, skip through commercials and all the rest.

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When declining ratings pushed WGCL-TV in Atlanta to shift Martha Stewart Living from its 9 a.m. time slot to the viewership graveyard at 3:30 a.m.

FORBES: Overcooked