Here's what I'm using on a 4.1.6 cart:
{* $Id: order_customer_complete.tpl,v 1.10 2006/03/31 05:51:43 svowl Exp $ *}
{config_load file="$skin_config"}
{include file="mail/html/mail_header.tpl"}
<p />{$lng.eml_dear|substitute:"customer":"`$customer. title` `$customer.firstname` `$customer.lastname`"},
<p />{$lng.eml_order_complete}
<hr size="1" noshade="noshade" />
<p />
<table cellpadding="2" cellspacing="1" width="100%">
<tr>
<td width="20%"><b>{$lng.lbl_order_id}:</b></td>
<td width="10"> </td>
<td width="80%"><tt><b>#{$order.orderid}</b></tt></td>
</tr>
<tr>
<td><b>{$lng.lbl_order_date}:</b></td>
<td width="10"> </td>
<td><tt><b>{$order.date|date_format:$config.Appear ance.datetime_format}</b></tt></td>
</tr>
{if $order.tracking}
<tr>
<td><b>{$lng.lbl_tracking_number}:</b></td>
<td width="10"> </td>
<td><tt>{$order.tracking}</tt></td>
</tr>
<tr>
<td>
<a href="http://wwwapps.ups.com/WebTracking/processRequest?HTMLVersion=5.0&Requester=NES&Agree ToTermsAndConditions=yes&loc=en_US&tracknum={$orde r.tracking}">Click here</a> to track if UPS has received your shipment.</td>
<td width=10></td>
<td>
You can also copy and paste your tracking number into the <a href="http://www.ups.com/WebTracking/track?loc=en_US">UPS Tracking Tool</a> if you prefer.</td>
</tr>
{/if}
<tr>
<td colspan="3">{include file="mail/html/
order_invoice.tpl"}</td>
</tr>
</table>
{include file="mail/html/signature.tpl}
We only use UPS so this one works well for us. Makes a clickable link to the tracking status of that number directly and also gives the option of using the tool. Further, this brings the invoice into the "order completed" mail sent to the customer.
Looks like the preview shows a space in the middle of {$order.tracking} it shouldn't be there.