title: How can svn co give a "directory already exists error"?
body: <pre><code>svn co svn+ssh://myhost/path/projectname/trunk projectname
  
  [...]
  
  svn: Failed to add directory 'projectname/test/.svn': an unversioned 
    directory of the same name already exists
  </code></pre>
  
  <p>How is that possible??</p>
  
  <p>I'm checking out into an empty dir.</p>
  
  <p>Same error checking out to Windows and OS X.</p>