One of the system requirements of Opera Mini is the presence of Java support, which is actually the feature that makes the application compatible with such a wide range of devices. Well, it seems the list will be expanded further now, with the requirement being effectively removed for cell phones running Windows Mobile 5 and 6. Opera Mini can now utilize the available system resources of the operating system and no longer needs Java to work properly. The overall functionality, however, remains identical to that of the current Java-utilizing edition of the application - you can open pages in separate tabs, store password and take advantage of a screen that provides quick access to regularly visited websites etc.
The latest version of Opera Mini can be downloaded for free (edition 5 beta 2) via this link.