Google Sites gives the ability to manage the attachments in your site. Select More Actions --> Manage Site. Below is a view of my portfolio Attachments page. This view allows you to locate the pages where specific attachments are located, and documents can be replaced, moved, renamed and deleted. This list is organized in reverse chronological order (most recent entry on top). This new feature of Google Sites provides a useful tool for managing attachments and file storage, which is limited to 100 MB in public Google Sites, and 500 MB in Sites that are part of a GoogleApps for Education instance.