The same powerful functionality that Zotero has long offered for traditional word processors is also available in Google Docs.
Google Docs support is part of the Zotero Connector for Chrome and Firefox and requires the Zotero program to function. A version of the Zotero Connector for Safari that supports Google Docs will be available in the near future.
The Zotero Connector adds a Zotero menu to the Google Docs interface:
It also adds a toolbar button for one-click citing: