This in from TV By The Numbers via press release for the week ending October 18, 2009 (“Echo” 9.04 episode):

THE BIG PLAYBACK!

THE CW AGAIN EARNS NETWORK TV’S LARGEST PERCENT GAINS FROM LIVE+7 DVR PLAYBACK

DVR Playback Doubles Ratings for 90210 Among Women,

Sophomore Drama Again Sees Largest Percent Gains of Any Show in Key Demos

THE VAMPIRE DIARIES, SMALLVILLE, 90210 and TOP MODEL Each Add More Than 1 Million Viewers Once All DVR Playback is Factored In

Smallville added just over 1 million more viewers (3.25mil v. 2.17mil) when the DVR playback was included.

SOURCE: TVbytheNumbers