According to the Google Apps Official Blog they have released version 1.6.7 of their Directory Sync tool. This tool allows Administrators to link up Active Directory (or other LDAP servers) to their Google Apps enviroment.
In older versions of the Google Apps Directory Sync the tool will provision new users/groups and sync LDAP directory information. With this new update it will automatically suspend Google accounts if the account is suspended inside the LDAP directory. The Google Apps Directory Sync tool is a one way sync. It only reads information from the directory to replace information inside of Google Apps, it will not sync back to the LDAP directory.