Today, Google is indexing all of your Gmail attachments and allowing you to pull up search results based on text that is inside these documents. Previously, users could only search for file types, document names, or the text that came along in the message that had the document attached. This should certainly help a few people out who can’t seem to find that important file.
Results may vary as Google has just begun listing out the data, but I tested it on a .txt file and it worked like a charm. It is said to work for many file types including PDF, DOC, PPT, and more. Thanks, Google!