Very oddly, there seems to be no way of setting Google Document links to open in a new window. (target=\"_blank\").
When publishing a Google Doc and using the embed
OK, in lack of a better alternative I decided to Curl the Google Doc URL and do some jQuery magic before loading it in an iFrame.
Curl.php
curl_setopt($ch, CURLOPT_URL, $Url);
[...]
$("#header").hide()
$("#footer").hide()
$('a[href^="http://"]').attr("target", "_blank");
Page.html
$("#google_content").html("");
Google, is this really the recommended workaround? ;)