Microsoft today announced more customers for its new Web-video platform, Silverlight, and outlined plans to build out the product's rich Internet application capabilities.

The company's competitor to Adobe's dominant Flash technology for online multimedia was detailed in April. Silverlight is part of Microsoft's broad "software plus services" strategy, designed to allow developers to make more complicated applications that take advantage of the desktop's power and capabilities from the Internet.

Another big play in the software plus services strategy is the Windows Live suite, which Microsoft is backing with a reported $300 million advertising campaign, according to anonymous sources quoted by the New York Post.

Microsoft has amassed several high-profile users of Silverlight, including Major League Baseball and now, the National Basketball Association's Web site, NBA.com. When the product was officially launched in September, Microsoft touted sites for Entertainment Tonight and World Wrestling Entertainment.

New features being added to Silverlight 2.0, due out in test form by March 2008, include tools for developers who want to make better user interfaces, layouts and advanced controls such as sliders in their Internet applications. All the details are laid out on Microsoft Developer Division GM Scott Guthrie's blog.