Skype isn't the only tool that will enable you to chat to other users, using your computer as a phone, over the Internet. The Gizmo Project is a rival product that will enable you to chat traditionally (traditionally being through the keyboard, directly to another Gizmo user) or use broadband to chat over the Internet, cheaply.
Gizmo Project 3 has now been released and contains a number of additional features. For instance, you're able to swap files with other Gizmo users (note that they need to be using Gizmo Project 3) and you can start a conference chat with more than one other user. Currently Gizmo Project 3 is only available for Windows users, as the Mac and Linux versions are still on a previous revision.
28 Feb 2007