I used this application the other day to do some online training and found it to be outstanding.  DimDim is an open source project and provides a great list of features when it comes to doing online presentations, product deomostrations or jsut sharing your desktop with someone else.

DimDim’s mission is to enable web collaboration for everyone. They believe that they can improve the world by providing easy, open and affordable collaboration software that anyone can use

One of the big pluses here is that it requires no client side software to be installed, is secure and supports VOIP.  Should you want to give DimDim a try, visit their site at: http://dimdim.com and sign up for a free account.

Why Dimdim?

• The easiest to use
• Nothing to install
• One click to share your:
  – Microphone & Webcam
  – Computer screen
  – Docs, website, whiteboard
  – Public & Private Chat
• Free for up to 20 participants
• Webinars & Audio Conferencing
• Free recordings & embeddings

This is not a paid promotion