Index: wp-admin/options-discussion.php
===================================================================
--- wp-admin/options-discussion.php	(revision 9161)
+++ wp-admin/options-discussion.php	(working copy)
@@ -43,15 +43,28 @@
 <br />
 <label for="close_comments_for_old_posts">
 <input name="close_comments_for_old_posts" type="checkbox" id="close_comments_for_old_posts" value="1" <?php checked('1', get_option('close_comments_for_old_posts')); ?> />
-<?php _e('Close comments on articles older than') ?></label> <?php printf(__('%s days'), '<input name="close_comments_days_old" type="text" id="close_comments_days_old" value="' . attribute_escape(get_option('close_comments_days_old')) . '" size="3" />') ?>
+<?php printf( __('Close comments on articles older than %s days'), '</label><input name="close_comments_days_old" type="text" id="close_comments_days_old" value="' . attribute_escape(get_option('close_comments_days_old')) . '" size="3" />') ?>
 <br />
 <label for="thread_comments">
 <input name="thread_comments" type="checkbox" id="thread_comments" value="1" <?php checked('1', get_option('thread_comments')); ?> />
-<?php _e('Group replies into threads') ?></label> <?php printf(__('%s levels deep'), '<input name="thread_comments_depth" type="text" id="thread_comments_depth" value="' . attribute_escape(get_option('thread_comments_depth')) . '" size="3" />') ?>
-<br />
+<?php 
+
+$maxdeep = (int) apply_filters( 'thread_comments_depth_max', 10 );
+
+$thread_comments_depth = '</label><select name="thread_comments_depth" id="thread_comments_depth">';
+for ( $i = 1; $i <= $maxdeep; $i++ ) {
+	$thread_comments_depth .= "<option value='$i'";
+	if ( get_option('thread_comments_depth') == $i ) $thread_comments_depth .= " selected='selected'";
+	$thread_comments_depth .= ">$i</option>";
+}
+$thread_comments_depth .= '</select>';
+
+printf( __('Enable threaded (nested) comments %s levels deep'), $thread_comments_depth );
+
+?><br />
 <label for="page_comments">
 <input name="page_comments" type="checkbox" id="page_comments" value="1" <?php checked('1', get_option('page_comments')); ?> />
-<?php _e('Break comments into pages with') ?></label> <?php printf(__('%s comments per page'), '<input name="comments_per_page" type="text" id="comments_per_page" value="' . attribute_escape(get_option('comments_per_page')) . '" size="3" />') ?>
+<?php printf( __('Break comments into pages with %s comments per page'), '</label><input name="comments_per_page" type="text" id="comments_per_page" value="' . attribute_escape(get_option('comments_per_page')) . '" size="3" />') ?>
 <br />
 <small><em><?php echo '(' . __('These settings may be overridden for individual articles.') . ')'; ?></em></small>
 </fieldset></td>