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http://httpd.apache.org/docs/2.0/vhosts/examples.html - official examples from Apache
http://mail-archives.apache.org/mod_mbox/httpd-users/200603.mbox/%3C200603161214.10191.mymaillists@gmx.at%3E - good working example of how to do virtual hosting with different ports.
http://httpd.apache.org/docs/2.4/upgrading.html#access - New Virtual host configuration Apache 2.4