Opera Mini 5.1 and has a beta for Series 60 platform Symbian, Which was launched in today and brings significant performance improvements. Which are significant startup times achieved and page loading and improved travel page.
Another important advance in this version is the greater integration with the platform, Which can be seen in the increased support for native methods of text input for the function to copy and paste each phone or the native mail client applications (for example, when selecting some email address).
There is also Opera Mini 5.1 beta support for more devices, and arguably most Symbian phones can use it as there is support for Series 60 2.0 and above. Unfortunately, that if this beta is available only in English even throw in more languages expected shortly.