The service, which is currently in beta, helps users sync up the video and slide portions of their presentations and share them online.
Viewers will be able to watch both either side-by-side or through picture-in-picture windows. Since the service and video are delivered via HTML5, viewers can watch the sam presentations on a PC or on mobile devices like the iPad.
The service will take advantage of a freemium model, allowing anyone to upload their video-enabled presentation online for free.
Find out more about it here: http://gigaom.com/video/9slides/