v2 - Updated to use no extra queries 
Okay, seeing as people asked for this, here it is. It's very, very simple in its operation.
It just keeps a record of the most number of visitors at any one time, and displays it on the main forums page. The time/date format will obey the system you specified in the control panel, including timezone offsets.

Installation is very simple. Simply download the attachment to this message, unzip it and upload install_maxonline.php to your forums/admin folder, then open that page in a web browser and carefully follow the instructions it will give you.
The script will only call an extra query if the number of online users is greater than that the previous record. The records are stored in a new template called 'MAXONLINERECORDS', which is automatically installed for you with the supplied script.
The install script has an upgrade option that will clean up the mess left by the original version...
You can see it working online at snyx' forum here
Extraordinarily Important Info
When you upgrade your board to a new version of vBulletin, you must modify the install script that you run like this:
Find
PHP Code:
$DB_site->query("DELETE FROM template WHERE templatesetid=-1 AND title<>'options'");
and replace it with
PHP Code:
$DB_site->query("DELETE FROM template WHERE templatesetid=-1 AND title<>'options' AND title<>'MAXONLINERECORDS'");
If you do not do this, your records will be destroyed when you upgrade.
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