Atlanta - IVideosongs.com on Monday announced the launch of its Web-based video music lessons from famous instructors, including Graham Nash (CSNY), Alex Lifeson (Rush) and Jeff Carlisi (.38 Special). The downloadable, HD videos cost $4.99 and teach aspiring guitarists, drummers, keyboard players and others how to play recognizable tunes. While a good portion of the instructional videos feature the original artists, more than half are taught by other professional instructors.

Palm Desert, Calif. - Zodiac Interactive, a developer of software for interactive television, on Monday introduced its new mobile content search engine, Zodigo, at the DEMO 08 conference. The search engine is compatible with digital TV systems, next-generation DVD players and game consoles, and enables consumers to use their TV remote control or PC to discover and download mobile content to their mobile phones.

Burlingame, Calif. - BitGravity on Monday introduced its BG LiveBroadcast platform at the DEMO 08 conference, which the company bills as the first cost-effective, carrier-grade, live broadcasting solution that lets media companies broadcast live content over the Internet to millions of viewers in a high-quality, highly-reliable experience that rivals television." The company said the Flash-based streaming service streamlines the necessary computers to a single device, and more than halves the cost of current installations for content providers.

West Palm Beach, Fla. - Mainstream Holdings announced on Monday that it has raised $29.6 million to help launch its social media start-up, Moli, from investors including Home Depot co-founders Bernard Marcus and Kenneth G. Langone, and Vantis Capital Management managing member Steven D. Holzman.