Index: wp-admin/edit-comments.php
===================================================================
--- wp-admin/edit-comments.php	(revision 17344)
+++ wp-admin/edit-comments.php	(working copy)
@@ -218,7 +218,7 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form id="comments-form" action="" method="post">
+<form id="comments-form" action="" method="get">
 
 <?php $wp_list_table->search_box( __( 'Search Comments' ), 'comment' ); ?>
 
Index: wp-admin/link-manager.php
===================================================================
--- wp-admin/link-manager.php	(revision 17344)
+++ wp-admin/link-manager.php	(working copy)
@@ -74,7 +74,7 @@
 }
 ?>
 
-<form id="posts-filter" action="" method="post">
+<form id="posts-filter" action="" method="get">
 
 <?php $wp_list_table->search_box( __( 'Search Links' ), 'link' ); ?>
 
Index: wp-admin/upload.php
===================================================================
--- wp-admin/upload.php	(revision 17344)
+++ wp-admin/upload.php	(working copy)
@@ -211,7 +211,7 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form id="posts-filter" action="" method="post">
+<form id="posts-filter" action="" method="get">
 
 <?php $wp_list_table->search_box( __( 'Search Media' ), 'media' ); ?>
 
Index: wp-admin/users.php
===================================================================
--- wp-admin/users.php	(revision 17344)
+++ wp-admin/users.php	(working copy)
@@ -358,7 +358,7 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form action="" method="post">
+<form action="" method="get">
 
 <?php $wp_list_table->search_box( __( 'Search Users' ), 'user' ); ?>