Hi Guys
If we look Joomla! Wiki
http://en.wikipedia.org/wiki/Joomla (http://en.wikipedia.org/wiki/Joomla)
It very useful it covers joomla development info and is regularly updated by people who use joomla
but the Virtuemart Wiki has no development info and should have
http://en.wikipedia.org/wiki/VirtueMart (http://en.wikipedia.org/wiki/VirtueMart)
the virtuemart manual has not been update since 2008 and will cost $1500 to update it
while the wiki free and every one a can contribute to improving it
Here's how to add a wiki article for virtuemart
http://en.wikipedia.org/wiki/Writing_your_first_article (http://en.wikipedia.org/wiki/Writing_your_first_article)