add some phpbb features to forums: show views on forum pages

I'm not keen on the way you have changed the arrays ($forum_topic_list_header and $rows). I'd be happier doing something like this:

$forum_topic_list_header = array(
  array('data' => ' '),
  array('data' => t('Topic'), 'field' => 'n.title'),
  array('data' => t('Replies'), 'field' => 'l.comment_count'),
  array('data' => t('Created'), 'field' => 'n.created'),
  array('data' => t('Last reply'), 'field' => 'l.last_comment_timestamp'),
);
if (module_exist('statistics'))
   $forum_topic_list_header[] = array('data' => t('Views'), 'field' => 'nc.totalcount');
$forum_topic_list_header[] = array('data' => t('Last reply'), 'field' => 'l.last_comment_timestamp');

Also, there should be an extra check than simply if the module exists. View counts are optional so you should check that they're on too.

This is not critical.

Not sure, but we might want to check whether the user is allowed to view the stats. The statistics.module has some permissions that might be relevant.

Yes, the statistics module has a permission 'view post access counter'. I currently have this off for authenticated users since our site is mostly informational rather than interactive (at the moment- still trying to entice the membership that gets postal mailings and comes to meetings to join into the online community).

Does this mean the patch needs work?

Yes needs permission checking and probably some updating for HEAD.
Also, it may require more significant reworking of a CCK type replaces the 'forum' type: http://drupal.org/node/62340

Bumping version.

just enable the statistics module + proper permission to stats access to get the views column.