– add new capability box;
– delete unused capability (except core WordPress capabilities) box;
– assign capabilities direct to user additionally to the role assigned to him;
– PHP4 is not supported by this plugin anymore. Update your site to PHP5 in order to use this plugin and near to release WordPress 3.2 🙂
– minor bugs and compatibility with other plugins fixes.
To get more information read these articles:
User Role Editor 3.1. Beta, User Role Editor WordPress Plugin