Any phone that supports HTML5 can now use Google Cloud Print and a printer to print out documents and Gmail while on the go. Phones HTML5 enabled should be able to use the application, which hooks up to your Windows PC printer (support for Mac and Linux are coming soon). Once installed, simply navigate to your mobile browser and use the dropdown box on the right to select "print". Gmail users will be happy to know that ".pdf" and ".doc" attachments can also be printed using this application.
On the source link is a button to install a version of the Google Chrome browser that includes an early release of the application which "may have some rough edges". Google Cloud Print has been in beta for about a year before today's rollout
The Google Cloud Print app will allow you to print documents and Gmail letters and attachments from your HTML5 enabled handset