Netflix has more than 20m members in the US

"With more than 20 million members in the United States and Canada, Netflix, Inc. [Nasdaq: NFLX] is the world’s leading Internet subscription service for enjoying movies and TV shows. For $7.99 a month, Netflix members can instantly watch unlimited movies and TV episodes streamed over the Internet to PCs, Macs and TVs. Among the large and expanding base of devices streaming from Netflix are Microsoft’s Xbox 360, Nintendo’s Wii and Sony’s PS3 consoles; an array of Blu-ray disc players, Internet-connected TVs, home theater systems, digital video recorders and Internet video players; Apple’s iPhone, iPad and iPod touch, as well as Apple TV and Google TV. In all, more than 200 devices that stream from Netflix are available in the U.S. and a growing number are available in Canada."
Source:  Netflix press information, retrieved 31st January 2011