There's on article on Collaboration Loop entitled Wither the Enterprise Wiki?
"Meanwhile, companies that have been using wikis internally for a while are now trying to wrestle them into one unified platform—and they need to make sure that as they extend their use to employees throughout the enterprise (or outside of it), the technology is easy to use. “Knowledge workers need tools that are user friendly, that look like something Microsoft would make,” says Jeff Brainard, Director of Product Marketing at SocialText.
Well that sounds like SharePoint to me - As I pointed out in my previous post "Enterprise 2.0, Web 2.0, Wikis, Blogs and Social Computing and SharePoint", Blogs and Wikis are a core component of Windows SharePoint Services.
Windows SharePoint Services is a component of Windows Server 2003 and conforms to the Windows Server 2003 licensing model. Organizations simply need to own Windows Server 2003 licenses to have the rights to also use Windows SharePoint Services. Learn more about licensing Windows Server 2003 and Windows SharePoint Services on the SharePoint licensing page.