What's more fun and challenging - because of ajax issues, is adsense in the last post.
That really gets the ad right where the reader's eyes are.
http://www.eaforums.com/forums/364919-post1.html
Find:
Code:
<!-- message -->
<div id="post_message_$post[postid]">$post[message]</div>
<!-- / message -->
Add above:
Code:
<if condition="(($post[postcount]==1) or ($post[islastshown] and !$GLOBALS['vbulletin']->GPC['ajax']))">
<span id="google" style="float:left;margin:2px;" width="340" height="290" align="center" valign="top">
put banner code here
</span></if>