Splitting Posts into columns in Magazine Pro. http://sridharkatakam.com/splitting-posts-columns-magazine-pro/

functions.php

<?php
//* Do NOT include the opening php tag

add_action( 'get_header', 'sk_posts_in_columns' );
function sk_posts_in_columns() {
	if ( is_home() || is_archive() ) {

		//* Display as columns
		add_filter( 'post_class', 'sk_display_in_columns' );

		//* Remove Featured image from Entry Content
		remove_action( 'genesis_entry_content', 'genesis_do_post_image', 8 );

		//* Show Featured image below Post info
		add_action( 'genesis_entry_header', 'sk_do_post_image', 12 );

		//* Modify the Excerpt read more link
		add_filter('excerpt_more', 'new_excerpt_more');
	}

}

function sk_display_in_columns( $classes ) {
	$columns = 3; // Set the number of columns here

	$column_classes = array( '', '', 'one-half', 'one-third', 'one-fourth', 'one-fifth', 'one-sixth' );
	$classes[] = $column_classes[$columns];
	global $wp_query;
	if( 0 == $wp_query->current_post || 0 == $wp_query->current_post % $columns )
		$classes[] = 'first';

	return $classes;
}

function sk_do_post_image() {
	// $image_args = array(
	// 	'size' => 'blog-featured-image'
	// );

	// echo '<div class="home-featured-image"><a href="' . get_permalink() . '">' . genesis_get_image( $image_args ) . '</a></div>';
	echo '<div class="home-featured-image"><a href="' . get_permalink() . '">' . genesis_get_image() . '</a></div>';

}

function new_excerpt_more($more) {
	return ' ...<a class="more-link" href="' . get_permalink() . '">[Read More...]</a>';
}

style.css

.blog .archive-pagination {
	clear: both;
}