We have released Zoho Wiki 2.0 few days back.

Main Feature:

* Workspaces
      Organizations can create independent, fully customizable workspaces exclusively for their departments, teams, branches, etc. Workspaces promote sharing and collaboration within the team and also with other groups. They can function as separate wikis, complete with own administrative controls, security setup and full customization option. For eg., An IT Company can have team spaces for different projects, for HR, for marketing, for sales, etc. Within a school wiki,  teachers can create individual workspaces for each class.

* Enterprise Level Wiki Permissions
      Wikis can have multiple group permissions for better access controls and thereby ensure fine grained security. A project wiki can be assigned to a particular team and can be shared with other team members and also with clients across the globe. You can clearly define as to who has edit permissions and who has view permissions.

* Enhancements in File Cabinet
      From within Zoho Wiki itself,  you can now create new documents, spreadsheets and presentations. Also, you can upload documents stored in Google Docs.

For more information http://blogs.zoho.com/general/introducing-zoho-wiki-2-0

Happy Wiking,
Mano