Imagine printing from your phone to a printer in your office ... or ... ugh .... to anywhere .... on any platform.
Imagine printing from your Windows Desktop to someone elses network half-way around the world .. running Linux or OS X.
Imagine Google Cloud Print.
Any printer will ultimately work but specific printers are being developed including a full line of 'cloud aware' printers from HP announced today.
Google has been making significant progress and two Googlers joined H-P in the announcement today (video below).
More documentation can be found here and today's update can be found on the Chromium Blog here.