No 2. Invisible defender

Perhaps the biggest threat to blogs is spamming and this plugin is here for the very reason of protection against it. This plugin will protect your registration, login and comments form by adding two extra fields hidden to the human interaction by CSS. The now available version of the plugin is updated to protect even against those spammers who modified their tactics to bypass the previous version of the plugin.

Go here to download.

No 1. WordPress Database Backup

Probably the single most important plugin for WordPress; it allows you to backup your core WordPress database tables and other tables in one single database. The plugin is compatible with WordPress versions from 2.0.3 to 2.9.2.

Go here to download.