Google has created a new web application called Google Wave which can be used for real-time communication using doc, rtf, photos, games etc.

For more information about google wave check http://wave.google.com/

Watch the below developer video of google wave

Below info taken from google

What is a wave?

A wave is equal parts conversation and document. People can communicate and work together with richly formatted text, photos, videos, maps, and more.

A wave is shared. Any participant can reply anywhere in the message, edit the content and add participants at any point in the process. Then playback lets anyone rewind the wave to see who said what and when.

A wave is live. With live transmission as you type, participants on a wave can have faster conversations, see edits and interact with extensions in real-time.