Index: wp-admin/export.php
===================================================================
--- wp-admin/export.php	(revision 16942)
+++ wp-admin/export.php	(working copy)
@@ -136,7 +136,16 @@
 	</li>
 	<li>
 		<label><?php _e( 'Authors:' ); ?></label>
-		<?php wp_dropdown_users( array( 'name' => 'post_author', 'multi' => true, 'show_option_all' => __('All') ) ); ?>
+		<select name="author" id="author">
+		<option value="all" selected="selected"><?php _e('All'); ?></option>
+		<?php
+		$author_ids = $wpdb->get_col( "SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = 'post'" );
+		$authors = $wpdb->get_results( "SELECT ID, display_name FROM $wpdb->users WHERE ID IN (" . implode( ',', $author_ids ) . ") ORDER BY display_name" );
+		foreach ( (array) $authors as $author ) {
+			echo "<option value='{$author->id}'>{$author->display_name}</option>\n";
+		}
+		?>
+		</select>
 	</li>
 	<li>
 		<label><?php _e( 'Date range:' ); ?></label>
@@ -165,7 +174,16 @@
 <ul id="page-filters" class="export-filters">
 	<li>
 		<label><?php _e( 'Authors:' ); ?></label>
-		<?php wp_dropdown_users( array( 'name' => 'page_author', 'multi' => true, 'show_option_all' => __('All') ) ); ?>
+		<select name="author" id="author">
+		<option value="all" selected="selected"><?php _e('All'); ?></option>
+		<?php
+		$author_ids = $wpdb->get_col( "SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = 'page'" );
+		$authors = $wpdb->get_results( "SELECT ID, display_name FROM $wpdb->users WHERE ID IN (" . implode( ',', $author_ids ) . ") ORDER BY display_name" );
+		foreach ( (array) $authors as $author ) {
+			echo "<option value='{$author->id}'>{$author->display_name}</option>\n";
+		}
+		?>
+		</select>
 	</li>
 	<li>
 		<label><?php _e( 'Date range:' ); ?></label>