preBind() - Add an event binding *before* any pre-existing bindings. (An early version, may not work in all scenarios)

jquery.prebind.js

$.fn.preBind = function(type, data, fn) {
	this.bind(type, data, fn);

	var currentBindings = this.data('events')[type];

	this.data('events')[type] = currentBindings.slice(-1)
		.concat(currentBindings.slice(0, -1));

	return this;
};