We talked previously about several ways to secure your blog.
With the new version of LifeType blogs (the system used on BlogExpat) we have implemented 2 new features:
It prevents spambots from accessing your site by analyzing their actual HTTP requests and comparing them to profiles from known spambots. It goes far beyond User-Agent and Referer, however.
It is activated by default on your blog.
Akismet checks your comments and trackbacks against the Akismet web service to see if they look like spam or not.
This plugin requires a WordPress.com API key.
When this plugin is installed, and a comment is received, the plugin contacts Akismet with the content of the comment. The response will contain information whethere Akismet thinks this comment is spam.
You have to activate this pugin on your Control Panel and provide a free WordPress.com API key.
Soon we will provide extra comment authentication for BlogExpat by using a 'captcha' image.