Hulu.com, the online baby of NBC Universal and News Corp., has begun private testing with select users at its Web site. Hulu is also launching videos to the sites of its five distribution partners: AOL, Comcast, Microsoft, MySpace and Yahoo!.

Hulu’s online video service offers viewers streaming, on-demand and premium programming on a free, ad-supported basis. Content includes full-length current and archived TV programming (such as “The Office,” “Bones” and “House”), as well as clips and an initial selection of feature films (such as “Sideways” and “Master and Commander”). thePlatform is providing content publishing and distribution services for the video venture.

Hulu has licensing deals with MGM Studios and Sony Pictures Television, as well as multiple broadcast and cable networks. NBC recently removed its content from YouTube in preparation for the Hulu introduction.

The company has also closed a $100 million investment from private equity firm Providence Equity Partners.