Views Bulk Operations

A must learn module: "This module augments Views by allowing bulk operations to be executed on the displayed rows. It does so by showing a checkbox in front of each row, and adding a select box containing operations that can be applied. Drupal Core or Rules actions can be used."

http:BL

From the project page, "Implementation of http:BL for Drupal. http:BL can prevent email address harvesters and comment spammers from visiting your site by using a centralized DNS blacklist. It requires a free Project Honey Pot membership. This module provides efficient blacklist lookups and blocks malicious visitors effectively.

Security Kit

"Module provides Drupal installation with various security hardening options. This lets your mitigate the risks of exploitation of different web application vulnerabilities."