Google Takes Printing to the Cloud
"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."
Google Cloud Print lets you print from Gmail in any current web browser, desktop or mobile. You need a Windows PC connected to the printer your want to print to right now but they're going to add support for Mac and Linux machines as well. Just go into Gmail from a browser and you will see a "Print" option in it's drop down menu near the top right. Besides just printing your messages it supports the printing of some attachments like .doc and .pdf files. Give it a try! Does this solve a specific printing need for you?