For the private area, Cedric indicates these plugins :

http://zone.spip.org/trac/spip-zone/browser/_core_/plugins/forum
http://zone.spip.org/trac/spip-zone/browser/_core_/plugins/sites
http://zone.spip.org/trac/spip-zone/browser/_core_/plugins/urls_etendues
http://zone.spip.org/trac/spip-zone/browser/_plugins_/gestion_documents

I would also add the plugin Agenda 2.0.
(generally, choose the plugins developped by Fil and Cedric ;) )

I'll use these as examples then. Thanks.

And those trac links are dead, by the way.

Cheers,

Thomas Sutton

Web Developer
bouncingorange
graphic + web design