<p>It's now on <a href="http://meta.stackexchange.com/questions/80647/why-is-logout-moved-to-my-profile-page" title="reason being being a reason">your profile page</a>.</p>

<p>Click your DisplayName in the header.</p>

<p>You'll come to a page that has the following links just left of your About Me section:</p>

<blockquote>
  <p>edit | add openid | log out</p>
</blockquote>

<p>Reason? Real estate in the header is premium and the "log out" link wasn't being used as much.</p>