Maxon - http://www.maxon.net - homepage for the maker of Cinema 4D
Plugin Cafe - http://www.plugincafe.com/ - page for programmers and developers
http://www.3dlinks.com/links.cfm?categoryid=13&subcategoryid=110
http://www.c4dcafe.com/ipb/index.php?download=110
http://people.brandeis.edu/~dong/cs207/cinema4d_index.html
http://www.vgd.co.uk/pages/notebook/seib/house_intro.html
http://www.maxoncomputer.com/tutorial_detail.asp?site=CAFE-DEV&tutorialID=200