Some friends pointed me to free episodes of the first 3 seasons of The Office (the American version):
Season 1: http://blog.coolz0r.com/2006/12/24/the-office-us-season-1/
Season 2: http://blog.coolz0r.com/2006/12/26/the-office-us-season-2/
Season 3: http://blog.coolz0r.com/2006/12/23/the-office-us-version/
UPDATE: If these links don't work anymore, you can check out tvparadise or openhulu (or better, Hulu, when it launches publicly).