<ul id="menu">
  <li><a href="#">Home</a></li>
  <li><a href="#">Work</a>
      <ul>
           <li><a href="#">CSS Development</a></li>
           <li><a href="#">Graphic Design</a></li>
           <li><a href="#">Development Tools</a></li>
           <li><a href="#">Web Design</a></li>
      </ul>
  </li>
  <li><a href="#">About</a></li>
  <li><a href="#">Contact Us</a></li>
  <li><a href="#">Feedback</a></li>
</ul>

#menu > li:last-child
{
    float:right;
}

<ul id="menu">
  <li><a href="#">Home</a></li>
  <li><a href="#">Work</a>
      <ul>
           <li><a href="#">CSS Development</a></li>
           <li><a href="#">Graphic Design</a></li>
           <li><a href="#">Development Tools</a></li>
           <li><a href="#">Web Design</a></li>
      </ul>
  </li>
  <li><a href="#">About</a></li>
  <li><a href="#">Contact Us</a></li>
  <li style="float: right;"><a href="#">Feedback</a></li>
</ul>

<ul id="menu" style="position:relative;width:1008px;height:40px;display:block;">
 <li class="right" style="position:absolute;right:20px;">
    <a href="#">Feedback</a></li>

<div class="top-menu">
    <ul class="nav navbar-nav pull-right"><li class="dropdown dropdown-user">
         <a href="javascript:;" class="dropdown-toggle" data-toggle="dropdown" data-hover="dropdown" data-close-others="true">
          <i class="icon-settings"></i>
          <i class="fa fa-angle-down"></i>
        </a>
       <ul class="dropdown-menu pull-right">
          <li>
            <a href="page_user_profile_1.html">
              <i class="icon-user"></i> My Profile
            </a>
         </li>
      </ul>
    </li>
  </ul>
</div>