Simple Homepage Layout for Genesis Framework.

simple-genesis-homepage.php

<?php
add_action( 'genesis_after_header', 'sf_featured_slideshow' );
/**
 * Add slide show widget area after the header.
 * 
 * @author Sure Fire Web Services
 * @link http://surefirewebservices.com/?p=1542
 *
 * @return Return null if not the homepage post.
 */
 
function sf_featured_slideshow() {
    if ( ! is_home() || ! is_front_page() ) 
             return;
 
    genesis_widget_area( 'home-featured-slideshow', array( 
            'before' => '<div id="home-featured-slider" class="widget-area">',
    ) );
}

add_action('get_header', 'sf_remove_loop');
/**
 * Remove Loop on Home Page Only
 * 
 * @author Sure Fire Web Services
 * @link http://surefirewebservices.com/?p=1542
 *
 */
function sf_remove_loop() {
  if ( ! is_home() || ! is_front_page() ) 
             return;  
	
	remove_action( 'genesis_loop', 'genesis_do_loop' );
}

/** Remove Standard Loop */
add_action( 'genesis_loop', 'sf_do_featured_boxes' );
/**
 * Add 3 featured boxes to the homepage.
 * 
 * @author Sure Fire Web Services
 * @link http://surefirewebservices.com/?p=1542
 *
 * @return Return null if not the homepage post.
 */
 
function sf_do_featured_boxes() {
    if ( ! is_home() || ! is_front_page() ) 
             return;
             
    remove_action( 'genesis_loop', 'genesis_do_loop' );
    echo '<div class="wrap">';
    genesis_widget_area( 'home-featured-1', array( 
        'before' => '<div id="home-featured-1" class="widget-area one-third first">', 
    ) );
    genesis_widget_area( 'home-featured-2', array( 
        'before' => '<div id="home-featured-2" class="widget-area one-third">',
    ) );
    genesis_widget_area( 'home-featured-3', array( 
        'before' => '<div id="home-featured-3" class="widget-area one-third">',
    ) );
    echo '</div>';
}


/**
 * Register Home Page Widget Areas.
 * 
 * @author Sure Fire Web Services
 * @link http://surefirewebservices.com/?p=1542
 *
 */
genesis_register_sidebar( 
    array(
        'id'            => 'home-featured-slideshow',
        'name'          => __( 'Feature Slideshow Area', 'themename' ),
        'description'   => __( 'This is the featured slide show area under the header.', 'themename' ),
) );
 
genesis_register_sidebar( 
    array(
        'id'            => 'home-featured-1',
        'name'          => __( 'Home Featured Left', 'themename' ),
        'description'   => __( 'This is the featured left area on the homepage.', 'themename' ),
) );
 
genesis_register_sidebar( 
    array(
        'id'            => 'home-featured-2',
        'name'          => __( 'Home Featured Middle', 'themename' ),
        'description'   => __( 'This is the featured middle area on the homepage.', 'themename' ),
) );

genesis_register_sidebar( 
    array(
        'id'            => 'home-featured-3',
        'name'          => __( 'Home Featured Right', 'themename' ),
        'description'   => __( 'This is the featured right area on the homepage.', 'themename' ),
) );

Commenting here for convenience.

• Home page is two words, not homepage (article).
• It's "WordPress", not "Wordpress" or "wordpress" (article).
• Watch out for code standards after commas (e.g. between parameters) - you're often missing a space. e.g. should be foo, bar not foo,bar.
• { and } on line 13 and 15 optional, as conditional action is only a single line.
• Lines 17, 39-40 are quite long - don't be afraid to put the arguments on multiple lines - makes it easier to read, and re-arrange as the code develops.
• Include a trailing comma after the last item in an array, even if it's only one item. Makes adding extra items easier, and easier to re-order items.
• When replacing a genesis_do_* function, keep the do part in your new function name.
• Line 38 and 42 - keep PHP strings as single quotes, and HTML as double-quotes.
• As noted in the article, since this is a tutorial for Genesis, re-use existing classes where possible - don't even bother suggesting fourcol as a class name (it also goes against the WP standard of splitting words in class names with hyphens).
• You've correctly prefixed your functions, but you've not prefixed the sidebar IDs.
• Keep => in multi-line arrays lined up with spaces, not tabs. Makes it easier to read values.
• Be careful about adding "left" and "right" to widget names - someone could style the divs to float in some other order, particularly in a RTL-language site.
• Description on line 62 is wrong.
• When doing multi-line function calls, keep the first argument on the next line after the opening ( i.e. array( from line 47 should be on line 48, indented as 'id' currently is, and everything else moved down a line:

genesis_register_sidebar(
    array(
        'id'          => 'home-featured-1',
        'name'        => __( 'Home Featured Left', 'themename' ),
        'description' => __( 'This is the featured left area on the home page.', 'themename' ),
    )
);

sf_featured_slideshow & sf_featured_boxes should have ()