Last Updated Jun 25, 2010 2:32 PM EDT
Previously, your only option for previewing .doc and .docx files was View as HTML, which usually produced mediocre results at best.
Now, whenever you receive an attached Word document, you can click View for a nicely formatted preview. Needless to say, you also have the option of opening the document in Google Docs.
In case you're wondering, GDocs already has viewers for PDF, PowerPoint, and TIF files. Looks like you're next, Excel! [via The Official Gmail Blog]