SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<ul id="activityStream">

 <li class="story">
  <div class="streamBox nobkgcolor" id="">
  Stuff
  </div>
 </li>

 <li class="story">
  <div class="streamBox nobkgcolor" id="">
  Stuff
  </div>
 </li>

 <li class="story">
  <div class="streamBox nobkgcolor" id="">
  Stuff
  </div>
 </li>

</ul>

CSS

.streamBox {
 font-size:12px;
 background-color:#EDEFF4;
 border-bottom:1px solid black;
 margin-top:2px;
 padding:5px 5px 4px;
}
li:last-child .streamBox {
   border: none;
}