Wirecast is a live production tool that allows everyone to easily broadcast live events and create professional webcasts from any location – all you need is a computer and an internet connection. With the intuitive and fully integrated streaming capabilities, Wirecast makes it easy for anyone to share live experiences and build a global community. Wirecast lets you stream multiple live cameras while dynamically mixing in other media such as movies, images, sounds, etc. Features including Chroma Key (blue/green screen), transitions and built-in titles allow you to create beautiful, professional broadcast productions for live or on-demand distribution on the web.
Wirecast – Turn your computer into a TV studio

    Full scale video production studio for your desktop or laptop computer
    Capture live video from multiple cameras & control switching between cameras
    Import pre-recorded video, audio, graphics and slides
    Picture in picture – enables viewers to see multiple sources, including the presenter/host
    Chroma key, 3D graphics & transitions – enable creation of professional quality webcasts
    Stream live and/or record to disk for on-demand viewing
    Encode to popular streaming formats (Flash, Windows Media & QuickTime)
    Simultaneous encoding to multiple bit rates – for a variety of quality choices

Homepage:http://www.telestream.net/