Preview docs in Gmail: You can preview Google docs attachments in Gmail.
Google Finance: Enter information from Google Finance into spreadsheets with this formula Syntax: =GoogleFinance("symbol"; "attribute").
Sync with your server: To work offline, your documents will have to be synced to your server.
Google Mobile: Use Google Mobile to access docs on your phone.
Print as a webpage: You can print your doc so that it displays as a web page.
Insert mathematical equations: Insert Equation makes an equation editor dialog box appear to add an equation to your doc.
GoogleTournament: Create brackets, and let Google automatically update data according to the Men’s and Women’s NCAA Division I Basketball Championship.
Enable offline access: You can install offline access for Google Docs to edit existing documents anywhere.
Track analytics: Track visits to published documents.
Update posts: You can republish posts that are already on your web page if you want to make edits and support an updated version.
Polyline: Draw shapes and lines in Google docs to make graphs, images and examples.
Docs Translation: Find the docs translator under Tools.
Snap to Guides: With this Edit feature, you can line up shapes in your doc automatically.
Reference tools: Google docs comes with access to a dictionary, thesaurus and encyclopedia that you can use within the document.
CSS Editing: Change the display of your doc by manually plugging in your CSS text.
HTML tags: Docs supports, or partially supports, some HTML tags, shown here.
Templates: Use Docs’ 300 templates to get started on different types of documents.
Work offline: View and edit documents even when you don’t have access to an Internet connection.
Create shortcuts: Create shortcuts and bookmarks for new documents, Google Docs home and more frequently visited pages.
Save as different file types: Instead of converting docs to different file types, you can simply change it to HTML, RTF, PDG, ODT and more whenever you save it.