Opera has taken its Mini browser out of beta testing for the Android platform. Opera Mini 5.1 is available as a free download either from the Android Market or directly from Opera. The beta program for the browser had been running since March. The Opera Mini browser offers a unique tabbed browsing interface, a polished user interface and Opera's server-side acceleration for the Opera Mini browser. With the Mini browser, Opera's servers compress images and text from Web pages and sends this compressed data to the phone. This enhances the speed at which pages load on the phone's Opera Mini browser.
source: Phone Scoop