From the press release:
Opera spreads the love to Android mobile phone users. Opera Mini 5.1 is now available for phones built on the Android platform, offering better browsing performance and improved user experience.
With over 61 million users worldwide, Opera Mini is the world’s most popular browser for mobile phones, allowing much faster browsing speeds, while keeping the costs to a minimum. Browse at lightning speed today by downloading the free Opera Mini browser from the Android Market or at m.opera.com.