New structure of GNOME Keyring
The source code of GNOME Keyring was restructured by the community, you can find the structure diagram at http://live.gnome.org/GnomeKeyring/Architecture


plex_layer is a roof module which adds all other pkcs11 modules.
ssh-store module is a module to load certificates under $HOME/.ssh/*
user-store is a module to store keyring or keys to $HOME/.gnome2/keyring
root-store is a module to load trusted root certificate authority certificate. Not sure how they are used.
rpc-layer is a layer which provides a unix daemon to service the PKCS#11 services.