The transformation of YouTube from a video search engine to a collection of programmed "channels" is about reinventing TV. But to reinvent TV, you have to get people watching a bit more like TV, which means getting viewers hooked on longer shows than the short clips that define YouTube.
On that front, YouTube has to like what's happening on Ad Age 's YouTube Channel Tracker this week, where some channels are getting a big boost from longer-than-usual episodes.