Found another one guys & i like this one, its a web2.0 wiki not tried it out as of yet but maybe will give it a test run
Deki Wiki -MindTouch Deki Wiki is a free open source wiki and application platform for communities and enterprises. Deki Wiki is an easy to use and sophisticated wiki for authoring, aggregating, organizing, and sharing content. Deki Wiki is also a platform for creating collaborative applications, or adding wiki capabilities to existing applications. Deki Wiki not just an award winning and easy to use web application for sharing, it's also a platform. Deki Wiki is similar to CMS web frameworks like
Drupal,
Mambo,
Joomla and
DotNetNuke, but a wiki in nature; therefore making it community-centric and significantly easier for end-users to participate. Also, it has a complete application programming interface (API) for programmers and extending Deki Wiki can be done in any programming language.