As the great race to become America's favorite source of full-length TV and movie streams gets underway, two of the favorites in that race are Hulu and Netflix. Hulu has a fairly large headstart. It is the No. 2 video site in the U.S after YouTube, and serves more than 1 billion videos a month . Meanwhile, Netflix, which is constantly adding to its catalog of streaming movies, only just broke into the top 20 last February. However, it is catching up fast, with serious streaming offerings on laptops , the Wii , and the iPad . These video view numbers come from comScore Video Metrix, but by a more recent, and more general, measure Netflix is edging past Hulu. According to comScore, plain Web traffic in terms of unique individual visitors to Netflix was 20.2 million in June, 2010, just edging past Hulu's 19.7 million (see chart). The vast majority of Netflix visitors are there to add movies to their mail-in DVD list, but increasingly they are starting to stream them directly as well. Overall traffic has been growing nicely since April, when Netflix streaming became available on the Wii. Traffic is up 15 percent since April (during a time when Hulu traffic has been essentially flat), and 46 percent from last year.