though addendum did contain a part on the venus project which did advocate a resource based economy, you shouldnt discredit the whole documentary because of that. whoever you listen to be it Peter Joseph (zeitgeist) or Alex Jones, you should never trust them fully. All thier movies I watch, I just learn to keep an open mind about things, if something doesnt agree with my logic / reasoning after investigating them myself, I just dont beleive in it.

also the venus project talked more about utilitarianism (common good) rather than marxism.

capitalism/communism/..  are all old systems based on scarcity but since theres no longer scarcity due to technological advancement, these ideas can be thrown away. Its all about a redesign of a culture

even a lot of fans are criticising it : http://www.thezeitgeistmovement.com/joomla/index.php?option=com_kunena&Itemid=3