diff -ru wordpress-3.3/wp-admin/network/settings.php /var/www/saytlar/blogo/wp-admin/network/settings.php
--- wordpress-3.3/wp-admin/network/settings.php	2011-12-13 06:00:41.000000000 +0000
+++ /var/www/saytlar/blogo/wp-admin/network/settings.php	2012-01-03 22:37:11.000000000 +0000
@@ -65,7 +65,7 @@
 		$limited_email = array();
 		foreach ( (array) $limited_email_domains as $domain ) {
 			$domain = trim( $domain );
-			if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) )
+			if ( ! preg_match( '/(\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) )
 				$limited_email[] = trim( $domain );
 		}
 		update_site_option( 'limited_email_domains', $limited_email );
@@ -78,7 +78,7 @@
 		$banned = array();
 		foreach ( (array) $banned_email_domains as $domain ) {
 			$domain = trim( $domain );
-			if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) )
+			if ( ! preg_match( '/(\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) )
 				$banned[] = trim( $domain );
 		}
 		update_site_option( 'banned_email_domains', $banned );
diff -ru wordpress-3.3/wp-admin/network/site-new.php /var/www/saytlar/blogo/wp-admin/network/site-new.php
--- wordpress-3.3/wp-admin/network/site-new.php	2011-12-13 06:00:41.000000000 +0000
+++ /var/www/saytlar/blogo/wp-admin/network/site-new.php	2012-01-03 23:47:22.000000000 +0000
@@ -127,7 +127,7 @@
 			<?php } else {
 				echo $current_site->domain . $current_site->path ?><input name="blog[domain]" class="regular-text" type="text" title="<?php esc_attr_e( 'Domain' ) ?>"/>
 			<?php }
-			echo '<p>' . __( 'Only the characters a-z and 0-9 recommended.' ) . '</p>';
+			echo '<p>' . __( 'Only letters, digits and dashes are recommended.' ) . '</p>';
 			?>
 			</td>
 		</tr>
diff -ru wordpress-3.3/wp-includes/ms-functions.php /var/www/saytlar/blogo/wp-includes/ms-functions.php
--- wordpress-3.3/wp-includes/ms-functions.php	2011-12-13 06:00:40.000000000 +0000
+++ /var/www/saytlar/blogo/wp-includes/ms-functions.php	2012-01-03 22:19:37.000000000 +0000
@@ -563,7 +563,7 @@
 	if ( empty( $blogname ) )
 		$errors->add('blogname', __('Please enter a site name'));
 
-	if ( preg_match( '/[^a-z0-9]+/', $blogname ) )
+	if ( preg_match( '/[^a-z0-9-]+/', $blogname ) )
 		$errors->add('blogname', __('Only lowercase letters and numbers allowed'));
 
 	if ( in_array( $blogname, $illegal_names ) == true )
diff -ru wordpress-3.3/wp-signup.php /var/www/saytlar/blogo/wp-signup.php
--- wordpress-3.3/wp-signup.php	2011-12-13 06:00:41.000000000 +0000
+++ /var/www/saytlar/blogo/wp-signup.php	2012-01-04 01:06:13.000000000 +0000
@@ -73,7 +73,7 @@
 	if ( !is_subdomain_install() )
 		echo '<span class="prefix_address">' . $current_site->domain . $current_site->path . '</span><input name="blogname" type="text" id="blogname" value="'. esc_attr($blogname) .'" maxlength="60" /><br />';
 	else
-		echo '<input name="blogname" type="text" id="blogname" value="'.esc_attr($blogname).'" maxlength="60" /><span class="suffix_address">.' . ( $site_domain = preg_replace( '|^www\.|', '', $current_site->domain ) ) . '</span><br />';
+		echo '<input name="blogname" type="text" id="blogname" value="'.idn_to_unicode(esc_attr($blogname)).'" maxlength="60" /><span class="suffix_address">.' . ( $site_domain = idn_to_unicode( preg_replace( '|^www\.|', '', $current_site->domain ) ) ) . '</span><br />';
 
 	if ( !is_user_logged_in() ) {
 		if ( !is_subdomain_install() )
@@ -127,7 +127,7 @@
 		echo '<p class="error">'.$errmsg.'</p>';
 	}
 	echo '<input name="user_name" type="text" id="user_name" value="'. esc_attr($user_name) .'" maxlength="60" /><br />';
-	_e( '(Must be at least 4 characters, letters and numbers only.)' );
+	_e( '(Must be at least 4 characters, latin letters and numbers only.)' );
 	?>
 
 	<label for="user_email"><?php _e( 'Email&nbsp;Address:' ) ?></label>
@@ -374,6 +374,7 @@
 }
 
 // Main
+$_POST['blogname']=idn_to_ascii($_POST['blogname']);
 $active_signup = get_site_option( 'registration' );
 if ( !$active_signup )
 	$active_signup = 'all';