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<!-- You know, the one typically at yoursite.com/wp-login.php. These are things you would put in the active theme's functions.php file. -->

<!-- Change the Logo -->

<!-- Is the WordPress logo by default, this changes the file path of that image. Change file path and file name to your own needs. -->

function custom_login_logo() {
   echo '<style type="text/css">h1 a { background: url('.get_bloginfo('template_directory').'/images/logo-login.gif) 50% 50% no-repeat !important; }</style>';
}
add_action('login_head', 'custom_login_logo');

<!-- Change the URL -->

<!-- ... of where clicking that logo goes. By default it goes to WordPress.org, this will change it to your own homepage. -->

function change_wp_login_url() {
   return bloginfo('url');
}
add_filter('login_headerurl', 'change_wp_login_url');

<!-- Change the Title -->

<!-- That is, change the title attribute of the image you just replaced. This changes it to the name of your blog in the settings. -->

function change_wp_login_title() {
   return get_option('blogname');
}
add_filter('login_headertitle', 'change_wp_login_title');