I noticed that this can conflict with the "Old Post Jump Method" mod. If you have that installed, and you wish to add this one, you might want to do what I did...
Instead of following the directions for postlist.tmpl, do this...
Find:
<br />{$postrow[$i]['oldjump']} <br />{$postrow[$i]['Subject']} <br /></a> <br />and replace with:
<br /><span title="{$postrow[$i]['body']}"> <br />{$postrow[$i]['oldjump']} <br />{$postrow[$i]['Subject']} <br /></a> <br /></span> <br />
