Meshrooms - Free meshes, shader, textures and tools for Cinema4D XL. - http://www.meshrooms.com
Cartoon Rendering - Create cartoon style rendering without using the Cel-Render option in CINEMA 4D, or any extra shaders. - http://www.xs4all.nl/~naam/cartoonrender.html
Creative New Media Design - Cinema 4D tutorials in pdf format for download designed to be used in order to enhance skill level. - http://www.jollup.co.uk/
The 7th Chamber - Downloadable tutorial in pdf format on how to model a 1955 Chevy Bel Air automobile using various HyperNURBS techniques in Cinema 4D XL v6.0+. - http://www.7thchamber.com/pages/chevtut.htm