Wimba's LiveClassroom is a web-based distance learning tool, that streams video and audio content to your web browser. In LiveClassroom, you can draw on a virtual whiteboard, use real-time messaging, and use 1-way or 2-way audio and 1-way video.
In addition, you can show any application in real time and even allow students to work on the application through LiveClassroom, poll students in real-time, track attendance, and present a wide array of content (web pages, PowerPoint presentations, PDF files, etc.)