Does anyone know a place where I can find some usage statistics on different CMSs? Also, do folks actually believe the massive massive Drupal share given here? (Netcraft claimed that Drupal was the sixth largest PHP-based CMS about a year ago; wish I could find the top five.)
I've found these stats to be the best:
If you click any of the CMS systems listed, it'll tell you the the 10 most popular sites using that CMS. The page also breaks down what % of each version is being used.
Here's an overview of how they did the research, which to me makes sense:
The link you posted appears to be fairly inaccurate as pointed out here among other places (Drupal is over-counted). Plus it ignores Wordpress which is perfectly usable as a CMS.
Although unscientific, I think the best place is Google Trends since it clearly shows which CMS have the most buzz around them. Trends for Wordpress, Joomla, Drupal and Expression Engine shows roughly this:
However all four of those systems are well-supported so I wouldn't use any figures like these to decide on a CMS - choose whichever one best meets your needs.