Found this neat: Skype 5.0 Easter Egg: Super Simple Way To Launch Conference Calls! http://bit.ly/f4gH9F
You can test Skype Group Video Calling with both a Mac or PC running Skype.
Image: Courtesy Skype
Group video calls can be between three or more people (up to a maximum of 10). For the best quality, we recommend calls with up to five people.Windows users need to be running Skype for Windows 5.1 or later.
For the best video quality, we recommend you use a high-speed broadband connection of 4 Mbps down/512 kpbs up and a computer with a Core 2 Duo 1.8 GHz processor. The minimum you'll need is a high-speed broadband connection of 512 kbps down/128 kpgs up and a computer with a 1 GHz processor.
Mac users need to be running Skype for Mac 5.0 or later.
I'm going to be testing this later today.