Index: wp-admin/includes/upgrade.php
===================================================================
--- wp-admin/includes/upgrade.php	(revision 18794)
+++ wp-admin/includes/upgrade.php	(working copy)
@@ -27,6 +27,7 @@
  * @since 2.1.0
  *
  * @param string $blog_title Blog title.
+ * @param string $blog_tagline Blog tagline/description
  * @param string $user_name User's username.
  * @param string $user_email User's email.
  * @param bool $public Whether blog is public.
@@ -34,7 +35,7 @@
  * @param string $user_password Optional. User's chosen password. Will default to a random password.
  * @return array Array keys 'url', 'user_id', 'password', 'password_message'.
  */
-function wp_install( $blog_title, $user_name, $user_email, $public, $deprecated = '', $user_password = '' ) {
+function wp_install( $blog_title, $blog_tagline, $user_name, $user_email, $public, $deprecated = '', $user_password = '' ) {
 	global $wp_rewrite;
 
 	if ( !empty( $deprecated ) )
@@ -47,6 +48,7 @@
 	populate_roles();
 
 	update_option('blogname', $blog_title);
+	update_option('blogdescription', $blog_tagline);
 	update_option('admin_email', $user_email);
 	update_option('blog_public', $public);
 
Index: wp-admin/includes/schema.php
===================================================================
--- wp-admin/includes/schema.php	(revision 18794)
+++ wp-admin/includes/schema.php	(working copy)
@@ -199,7 +199,7 @@
 	'siteurl' => $guessurl,
 	'blogname' => __('My Site'),
 	/* translators: blog tagline */
-	'blogdescription' => __('Just another WordPress site'),
+	'blogdescription' => __(''),
 	'users_can_register' => 0,
 	'admin_email' => 'you@example.com',
 	'start_of_week' => 1,
Index: wp-admin/install.php
===================================================================
--- wp-admin/install.php	(revision 18794)
+++ wp-admin/install.php	(working copy)
@@ -83,6 +83,7 @@
 		$blog_public = isset( $_POST['blog_public'] );
 
 	$weblog_title = isset( $_POST['weblog_title'] ) ? trim( stripslashes( $_POST['weblog_title'] ) ) : '';
+	$weblog_tagline = isset( $_POST['weblog_tagline'] ) ? trim( stripslashes( $_POST['weblog_tagline'] ) ) : '';
 	$user_name = isset($_POST['user_name']) ? trim( stripslashes( $_POST['user_name'] ) ) : 'admin';
 	$admin_password = isset($_POST['admin_password']) ? trim( stripslashes( $_POST['admin_password'] ) ) : '';
 	$admin_email  = isset( $_POST['admin_email']  ) ? trim( stripslashes( $_POST['admin_email'] ) ) : '';
@@ -98,6 +99,10 @@
 			<td><input name="weblog_title" type="text" id="weblog_title" size="25" value="<?php echo esc_attr( $weblog_title ); ?>" /></td>
 		</tr>
 		<tr>
+			<th scope="row"><label for="weblog_tagline"><?php _e( 'Site Tagline' ); ?></label></th>
+			<td><input name="weblog_tagline" type="text" id="weblog_tagline" size="25" value="<?php echo esc_attr( $weblog_tagline ); ?>" /></td>
+		</tr>
+		<tr>
 			<th scope="row"><label for="user_name"><?php _e('Username'); ?></label></th>
 			<td>
 			<?php
@@ -182,6 +187,7 @@
 		display_header();
 		// Fill in the data we gathered
 		$weblog_title = isset( $_POST['weblog_title'] ) ? trim( stripslashes( $_POST['weblog_title'] ) ) : '';
+		$weblog_tagline = isset( $_POST['weblog_tagline'] ) ? trim( stripslashes( $_POST['weblog_tagline'] ) ) : '';
 		$user_name = isset($_POST['user_name']) ? trim( stripslashes( $_POST['user_name'] ) ) : 'admin';
 		$admin_password = isset($_POST['admin_password']) ? $_POST['admin_password'] : '';
 		$admin_password_check = isset($_POST['admin_password2']) ? $_POST['admin_password2'] : '';
@@ -212,10 +218,10 @@
 
 		if ( $error === false ) {
 			$wpdb->show_errors();
-			$result = wp_install($weblog_title, $user_name, $admin_email, $public, '', $admin_password);
+			$result = wp_install($weblog_title, $weblog_tagline,  $user_name, $admin_email, $public, '', $admin_password);
 			extract( $result, EXTR_SKIP );
 ?>
-
+`	
 <h1><?php _e( 'Success!' ); ?></h1>
 
 <p><?php _e( 'WordPress has been installed. Were you expecting more steps? Sorry to disappoint.' ); ?></p>