My WordPress plugins:

• WPBayes, a Naive Bayesian spam filter for WordPress
• Code Autoescape, automatically escape code within code blocks so that you don't need to escape them by yourself.
• Browser Detection, detects web browser used by visitors and comment writers.
• PHP Exec, interpret PHP codes in posts and pages
• Yahoo/MSN Messenger Style Smileys, use Yahoo/MSN style smileys instead of built-in WordPress smileys
• IP to Country, resolve an IP address to its country origin, useful for detecting origin of comment writers.

-- Priyadi Iman Nurcahyo