My take on a hoverIntent plugin for jQuery.

jquery-hoverintent.js

jQuery(function ($) { 
    $.event.special.hoverIntent = (function () {
        var hoverIntentDelay = 200;
        return {
            'setup': function (data, namespaces) {
                var namespace,
                    $el;
                    
                namespace = namespaces.length ? '.' + namespaces.join('.'): '';
                $el = $(this);
                
                $el.on('mouseenter.hoverIntent' + namespace, (function () {
                    var timeoutID;
                    return function () {
                        window.setTimeout(function () {
                            $el.trigger('hoverIntent' + namespace);
                        }, hoverIntentDelay);
                        
                        $el.one('mouseleave', function () {
                            window.clearTimeout(timeoutID);
                        });
                    };
                })());
            },
            
            'teardown': function (namespaces) {
                var namespace,
                    $el;
                
                namespace = namespaces.length ? '.' + namespaces.join('.'): '';
                $el = $(this);
                
                $el.off('mousenter.hoverIntent' + namespace);
            }
        };
    })();
    
    $.fn.hoverIntent = function (fnOver, fnOut) {
        return this.on('hoverIntent', fnOver).on('mouseleave', fnOut || fnOver);
    };
});