Gmail becomes more awesome with each day, and I've said it before, and I'll say it again - I love it. I'm a huge Google user and every little thing that they add to their software suite makes it better and better with each day.
Now the search giant have pushed out a new feature - letting you find old attachments by searching for text inside of them, yes, inside of the attachment itself. Before now, you could only find an attachment if your searched for the message's text, filename, or file type.
But, Gmail's new super power now lets you search for text within .doc, .pdf, .ppt, and other files where Gmail will display them in its search results. Google are rolling this feature out now, and the indexing within your Gmail account will take a little while, as expected.