Add to the list the Skype plugin for Pidgin:   http://eion.robbmob.com/
Skype is what I mostly use these days when I collaborate with someone
remotely.

  --- Alex.

On Wed, Apr 20, 2011 at 12:58:11AM -0500, Bob McElrath wrote:
> Alexander Shumakovitch [shu...@gwu.edu] wrote:
> > 
> > Now, concerning the issue of authentication and sharing of the data. I 
> > believe
> > that the easiest solution would be to use the existing IM infrastructure.
> 
> Using existing IM infrastructure has another serious advantage: most of the 
> time
> your communication is not solely by shared whiteboard/xournal.  Virtually
> everyone will also be on the phone or IM with each other while simultaneously
> sharing a xournal page (assuming they're not in the same room).
> 
> It should be fairly straightforward to write e.g. a Pidgin plugin that 
> launches
> xournal and attaches it to the current IM conversation.  See for instance:
>     http://xmpp.org/xmpp-protocols/xmpp-extensions/
> specifically:
> Jingle: http://xmpp.org/extensions/xep-0166.html
>     This specification defines an XMPP protocol extension for initiating and
>     managing peer-to-peer media sessions between two XMPP entities in a way 
> that
>     is interoperable with existing Internet standards.
> XMPP In-Band Bytestream: http://xmpp.org/extensions/xep-0047.html
> Shared XML Editing: http://xmpp.org/extensions/xep-0284.html
> Feature Negotiation: http://xmpp.org/extensions/xep-0020.html
>     do you have collaborative xournal?
> XHTML-IM: http://xmpp.org/extensions/xep-0071.html
>     strokes could be encoded as HTML canvas objects
> 
> Pidgin plugins: http://developer.pidgin.im/wiki/Scripting%20and%20Plugins
> 
> --
> Cheers,
> Bob McElrath [ Heidelberg University, Theoretical Physics ]
> 
> "If you're not failing every now and again, it's a sign you're not doing
> anything very innovative." -- Woody Allen

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