NBC’s Thursday ratings dive

From MediaWeek:

NBC’s ongoing rating woes were clearly visible on Thursday, April 12, with its combination of My Name is Earl, The Office [Safety Training], 30 Rock, Scrubs and ER resulting in the network’s worst performance in the traditional (September to May) season since at least the inception of People Meters (1987) — and perhaps historically — on this once-pivotal evening.

Wow. What is going on here?

Link: NBC Drops to Historical Thursday Low