Customizing the wordpress loop in twenty ten theme

I'm trying to customize the loop in wordpress's twenty ten theme to display one one post of three categories on the home开发者_如何转开发 page. Is it suggested to use twenty ten? I'm attempting to recreate something similar to Good Magazine's layout.

thank you

    $args = array(
        'category__in' => array(1,2,3),
        'showposts' => 1,
    'order'    => 'DESC'
    );

    query_posts( $args );

If you post what you have so far, we can give you more detailed answers.