Let's say you need to print an important email attachment on your  way to work so that it's waiting for you when you walk in the door. With  Gmail for mobile and Google Cloud Print — a service that allows  printing from any app on any device, OS or browser without the need to  install drivers — you can. 
To get started, you'll first need to connect your printer to Google Cloud Print. For now, this step requires a Windows PC but Linux and Mac support are coming soon. Once you're set up, just go to gmail.com  from your iPhone or Android browser and choose "Print" from the  dropdown menu in the top right corner. You can also print eligible email  attachments (such as .pdf or .doc) by clicking the "Print" link that  appears next to them. 
 We're  rolling this feature out in U.S. English over the next few days, so if  you don't see it right away please check back. In the meantime, you can  learn more in the Google Cloud Print help center.
source: http://gmailblog.blogspot.com/2011/01/print-from-your-phone-with-gmail-for.html
 
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