Iíve been hammered with comment spam in the last few days and had to deal with more than 30 of such comments daily. I never thought of installing an anti-spam plugin before, thinking that an occasional Viagra or poker spam would be easy to moderate. But having to delete comment and trackback spam every once in a while proved to be irritating. I download Akismet, installed the plugin, copied my WordPress.com API key and activated it. I havenít had comment spam since then.