Scans your WordPress installation for security vulnerabilities and suggests corrective actions.
-password tools
-file/folder permissions scanning/corrections
-database security scanning/tools
-version hiding
Future Releases
*one-click change file/folder permissions
*test for XSS vulnerabilities
*intrusion detection/prevention
*lock out/log incorrect login attempts
more information here: http://wordpress.org/extend/plugins/wp-security-scan/
WordPress Security
Edit: This plugin is currently in Beta stage. Use at your own risk.