WordPress.org

This plugin will redirect users assigned to the subscriber role when they try to access any wp-admin page (is_admin() is true). This plugin will also hide the admin bar for those users in WordPress 3.1+.

Users belonging to any of the other WordPress roles will continue to see and have access to the other sections of the WordPress admin that correspond to their role's capabilities.

Note: Version 1.0.0+ requires a minimum of WordPress 3.1. If you are running a version less than that, please upgrade your WordPress install before installing or upgrading.