'cb_data->data->dbus_connection' failed

I also have this error with latest Hardy (RC from 2008-04-19). I've CIFS share mounted on startup from /etc/fstab. I've discovered that when I configure in network-manager my network card (ethernet) to roaming mode I always get these messages and it does take an extremely long time to shutdown. I thought that it was since message about deactivating eth0 were earlier than messages about contacting CIFS server.

But when go into network-manager, disable roaming connection for eth0 and set it to DHCP everything works OK and usplash screen behaves normally until full shutdown. Maybe it will help to trigger this problem.