The popular Google Sightseeing blog which points you to cool satellite views within Google Maps has now announced that it will integrate with Google Earth as well:
Every post now has a ‘Google Earth’ link as well as a ‘Map’ link. Clicking on the Google Earth link will zoom your copy of Google Earth to any of the sights listed in that post.
They've also announced a "network link" feature, complete with instructions, which allows you to integrate ALL Google Sightseeing "sights" directly into Google Earth, allowing you to browse their content from within the Google Earth application instead of using the blog as the interface.
Yet, another Google Earth hack. :)