Not sure if you have seen this quick YouTube video from Mike Agerbo, of Get Connected fame. He gives a two minute review of Groove 2007 and OneNote 2007. Its a good pointer if you are trying to explain Groove 2007 to someone for the first time. Although it implies that you need Communicator in order to use instant messages, its a good quick review.
link to this page: http://blogs.technet.com/groove/archive/2008/04/03/groove-tube.aspx
link to this page:http://blogs.technet.com/groove/archive/2008/03/26/updates-to-groove-web-services-helpers.aspx
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Very nice find, I'm always struggling explaing Groove to people, and always get myself caught when explaing the synergy between Sharepoint and Groove.
Not sure if you have seen this quick YouTube video from Mike Agerbo , of Get Connected fame. He gives