When a post gets old, instead of simply closing the discussion, send comments and trackbacks to the moderation queue. This will greatly reduce spam.
For documentation and tips, please refer to the official plugin page for <a href="http://planetozh.com/blog/archives/2005/02/02/wordpress-plugin-auto-moderate-comments/" title="Auto Moderate Comments" rel="nofollow ugc">Auto Moderate Comments</a>

Ozh' Auto Moderate Comments

When a post gets old, instead of simply closing the discussion, send comments and trackbacks to the moderation queue.

Creates a Rewrite Rule that will allow users to log in from the custom URL <code>yoursite.com/login</code> instead of <code>/wp-login.php</code>.
This plugin is an example of one of the many possibilities of WordPress’ Rewrite API. See the whole <a href="http://planetozh.com/blog/2011/01/pretty-login-url-a-simple-rewrite-api-plugin-example/" rel="nofollow ugc">Rewrite API tutorial</a> on Ozh’ blog.

Ozh' Simpler Login URL

Creates a Rewrite Rule that will allow users to log in from the custom URL yoursite.com/login instead of /wp-login.php.

Ozh' Auto Moderate Comments vs Ozh' Simpler Login URL