Find your stuff faster in Gmail and Search | Official Gmail Blog

Evernote Simultaneous Search is another option for having your personal content appear in search results (from Google, Bing, Yahoo, and others); also see Google Amps Up Personal Search to Combine Gmail, Calendar, Drive and More (AllThingsD)

"So starting today, you can sign up for a new and expanded field trial that makes it easier to find your stuff across Google, whether you’re searching on Google.com or searching in Gmail.
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Similarly, when you search on Google.com, your results will include relevant information and messages from Gmail (something familiar to those who joined the original field trial) and now -- new in this field trial -- also files, documents, spreadsheets and more from Google Drive"

Find your stuff faster in Gmail and Search | Official Gmail Blog