Valve does this automatically through their Perforce system. This isn't available to the modding community, but if you put your game in a source control system, (Subversion and git are two popular ones) you can have each artist use it and update/commit their stuff as they change it.
-- Jorge "Vino" Rodriguez _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlcoders