Microsoft SharedView Beta [Code Name : Tahiti]
Microsoft SharedView Beta is a fast, easy way to share documents and screen views with small groups of friends or coworkers; anytime, anywhere. Use SharedView to put your heads together and collaborate.
Free download is available here,
http://www.connect.microsoft.com/site/sitehome.aspx?SiteID=94
Features:
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It works across firewalls.
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Integrates into office 2007
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Integrates with Windows Live Messenger
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It has an option to Track changes in Word
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Can share the desktop
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Each participant can have his own mouse pointer
Download the beta available at the above link..