Probably the single most popular Java application has been updated, as Opera Mini reached version 3.1. The new version brings better connectivity options and memory management, improved RSS feed management and support for more mobile phones. Also, most (if not all) of the known bugs have been fixed.
Opera Mini is still free, and you can download it from the official OperaMini.com website. If you want to know what exactly has been changed in the new version, check out this post on OperaMini blog.