most q3 coding tutorial are lost nowadays, while googling I found an interesting site that host backup to lost forever tutorials, enjoy!
http://www.quake3hut.co.uk/q3coding/I don't know if they can be considered in public domain or under 'fair use', anyway it would be cool to make a wikibook about q3 moding an host it on
http://en.wikibooks.org/wiki/Main_Page