Thanks much for this mod. I think there is minor error in latest 1.3 (16-02-2008) package.  This line:

  <form id="movepost_move" method="post" action="movepost.php?<?php echo (isset($post_ids)?'ids='.$post_ids:'id='.$post_id) ?>"><? if ($new_fid) echo '&new_fid='.$new_fid;?>">

Should probably be:

  <form id="movepost_move" method="post" action="movepost.php?<?php echo (isset($post_ids)?'ids='.$post_ids:'id='.$post_id) ?><? if ($new_fid) echo '&new_fid='.$new_fid;?>">

There's an extra form closing quote and tag when $new_fid exists. You can this in the current demo site too. I'm also seeing random "Invalid Code" messages when submitting the move posts form. It doesn't happen all the time, and I haven't been able to figure out what causes it yet.

But again, thanks very much for developing this. I'm new to punBB and didn't feel comfortable putting up PunBB v1.3 beta yet, but definitely need the move posts functionality.