If you ever look at headers on a Wordpress.com hosted site you'll get a job ad, check it out: http://gist.github.com/346227
HTTP/1.1 200 OK
Server: nginx
Date: Mon, 17 May 2010 07:17:29 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Last-Modified: Mon, 17 May 2010 07:17:26 +0000
Cache-Control: max-age=27, must-revalidate
Vary: Cookie
X-hacker: If you're reading this, you should visit automattic.com/jobs and apply to join the fun, mention this header.
X-Pingback: http://wordpress.com/xmlrpc.php
Link: <http://wp.me/1>; rel=shortlink
X-nananana: Batcache