The W3C Device Description Working Group has posted the first working draft of a note on Device Description Landscape. According to the note,
Developing Web content for mobile devices is more challenging than developing for the desktop Web. Compared to desktop Web clients, mobile Web devices come in a much wider range of shapes, sizes and capabilities. The mobile Web developer relies upon accurate device descriptions in order to dynamically adapt content to suit the client.
This Note describes what efforts the W3C and other organizations are doing in order to provide accurate device descriptions.