useful links
Key immigration facts from the German Foreign Office
http://www.auswaertiges-amt.de/sid_3195C92164EAA0FE5A6F8F01EC2FCA57/EN/Startseite_node.html
http://www.bern.diplo.de/contentblob/1681320/Daten/106478/DownloadD_Your_Job_in_Germany.pdf