DKMessenger
DKMessenger is a free peer-to-peer messenger with video, Voice Over IP, text chat, whiteboard, application sharing and file transfer capabilities. If you have a microphone and a camera hooked up to your PC, DKMessenger works as a free videophone. If no microphone is available, the... DKMessenger now supports Application Sharing! ... Let your buddies see any application running on your desktop! ... NEW! ... All this happens in real time and conversations occur as fast as you type.
http://dkmessenger.com/setup/dkm_setup.exe - 5Mb - Download - Screenshot