In April 2010, Google Cloud Printing became a beta service which allowed Google users to print documents from any browser, app or operating system without the need to install print software. Since the launch, the service was expanded to those that were on the Chrome notebook pilot program and as of yesterday, the service has been expanded once again.
Over the course of the next few days, Google Cloud Print will expand to mobile documents as well as Gmail for mobile. This feature is about convenience. A mobile user could be heading to work and on his way in, could print a document using his smartphone, only to find the printout waiting for him once he arrives. The feature is also easy to use as you only need to open the document from within Google documents or in the case of email, open it through Gmail and then select the print option from the dropdown menu that is located in the top right corner of the page. Google Cloud Print also supports some email attachments such as Adobe PDF files which will have a Print link located next to them.
Google Cloud Print will first roll out to English users within the US and will require HTML5 which is found on iOS 3+ and Android 2.1+. In order to setup this print function, you do need to connect your printer to the service, a process that for now requires a Windows based computer. Down the road, Google plans to also include support for both Mac and Linux.