Google has announced today that it intends to start indexing and making available via its search engine publicly published Google App documents .
It actually never occurred to me that they didn’t already, but now they announced it all you Google App admin people should make sure that you are happy for your Users to publish outside your domain. From the announcement I can only assume that any previously published documents will continue to be published and if this needs to be changed it will need to be done on a per user per document basis.
Looking at the options you are pretty much covered in you options going forward, in that you can prevent it, allow it but with a warning and allow it without the warning. It would be nice to allow it on a user or group basis so that collaboration outside the domain can occur for specific users and or groups of users.