Check it out:

http://mail.google.com/videochat

Works like a charm... just need a webcam and headset.

Here's what you'll need to get started:

* Download the Gmail voice and video chat plug-in, quit all open browser windows, and install the plug-in.
* Sign in to Gmail.
* In the Chat section of your Gmail, select the contact you want to call. If they have a camera icon next to their name, you can make a voice or video call to them; just click Video & more.