CMS Wire has a good, albeit SharePoint-centric article on the results, which shows us that EMC, IBM, Microsoft, Open Text, and Oracle lead the way, with other vendors nipping at their heels.
This year's report takes a look at a total of 18 enterprise content management vendors, including the mainstays mentioned above, as well as Interwoven, SAP, and some lesser-known (but solid) names such as Alfresco, Day Software, and Xythos.
While Microsoft Office SharePoint Server (MOSS) doesn't lead overall -- that honor appears to go to EMC -- it continues to be the closest thing to a household name that the enterprise content management industry has, which tends to make it the center of attention.
It's not available on the site yet but, Gartner should offer the individual report for sale soon. It's also probably worth noting that Gartner's Magic Quadrant reports are generally pricey -- usually around $2,000 for 15 to 20 pages of content -- so that may be a consideration for some organizations.