<p>In the comments on a question about the new answer votes, Robert Cartaino said:</p>

<blockquote>
  <p>The dedicated site for announcements
  is the blog:  blog.stackexchange.com. </p>
  
  <p>If that does not provide enough
  detail, there is a "Recent Feature
  Changes" list:
  <a href="http://meta.stackexchange.com/questions/59445/recent-feature-changes-to-stack-exchange">http://meta.stackexchange.com/questions/59445/recent-feature-changes-to-stack-exchange</a></p>
  
  <p>Beyond that lies meta.Stackoverflow,
  which gets into the really
  nitty-gritty, insider-baseball stuff. </p>
  
  <p>Three resources to pick from,
  depending on your level of interest in
  this stuff.</p>
</blockquote>