Google Launched its latest service – Google Cloud print last year that allows users to print from the Chrome OS, Chrome browser or Smart phones via Cloud. Now Google Cloud Print supports Google Docs and Gmail printing for mobile phones. For this you need a Google account and need to add your printer to Google Cloud Print.
Check this video demo of Cloud Print:
This needs a Windows PC connected to the printer. Mac and Linux support coming soon. There is no need to install any software or driver to your Phone or PC. This works on Android devices 2.1+ and iOS 3+. This service is available now in U.S in English and coming soon to other countries and in many more Languages.