Fading in last sidebar widget as it is scrolled to and making it fixed in Genesis. http://sridharkatakam.com/fade-last-sidebar-widget-scrolled-make-fixed-genesis/

functions.php

add_action( 'wp_enqueue_scripts', 'enqueue_sticky_last_widget' );
function enqueue_sticky_last_widget() {

	wp_enqueue_style( 'animate', get_stylesheet_directory_uri() . '/css/animate.min.css' );

	wp_enqueue_script( 'waypoints', get_stylesheet_directory_uri() . '/js/waypoints.min.js', array( 'jquery' ), '1.0.0' );
	wp_enqueue_script( 'waypoints-init', get_stylesheet_directory_uri() .'/js/waypoints-init.js' , array( 'jquery', 'waypoints' ), '1.0.0' );

	wp_enqueue_script( 'jquery-sticky', get_stylesheet_directory_uri() .'/js/jquery.sticky.js' , array( 'jquery' ), '1.0.0' );
	wp_enqueue_script( 'jquery-sticky-init', get_stylesheet_directory_uri() .'/js/jquery.sticky.init.js' , array( 'jquery-sticky' ), '1.0.0' );
}

jquery.sticky.init.js

jQuery(document).ready(function($) {

	$(".sidebar-primary .widget:last-child").sticky({getWidthFrom: ".sidebar-primary .sticky-wrapper", className: "stuck"});

});

style.css

/*
Fading in last sidebar widget as it is scrolled to and making it fixed
-----------------------------------------------------------------------------*/

.sidebar-primary .widget:last-child {
	filter: alpha(opacity=0);
	opacity: 0;
	/*animation-duration: 1.5s;*/
}

.admin-bar .stuck .widget {
	top: 28px !important;
	/*top: 68px !important;*/
}

waypoints-init.js

jQuery(function($) {

	$('.sidebar-primary .widget:last-child').waypoint(function(direction) {
		if (direction == 'up') {
			$(this).removeClass( 'fadeIn' ).addClass( 'fadeOut' );
		}
		else {
			$(this).removeClass('fadeOut').addClass( 'animated fadeIn' );
		}
	},
	{
		offset: '50%',
	});

});