Networked physics in Mercenaries2
(last update 29.February 2008 21:9)
Slides of Gaffer's GDC2008 talk about networked physics.
Seems like something new in the industry because until now I can't remember a game which used physics simulation in multiplayer.
Gaffer on Networked Physics
(last update 16.January 2008 17:48)
Good place to start at.
Also many helpful comments.
Networked Physics at Box2D forums
(last update 16.January 2008 17:50)
Disscussion about networked physics.
Few ideas and maybe some source code, too :)