First extensive assessment of open source cms market share
water&stone has released a report on 19 of the most popular open source content management systems. Each system is evaluated on a wide variety of traditional and Web 2.0 metrics. Conclusions indicate the market leaders, as well as who might be in danger, and who might be rising stars.

50 pages long -- it's thorough. Grab it at the water&stone CMS resources page, or download directly here.

Rico! of waterandstone.com