I maintain two (early stages) websites that use Wikka for mainly the back end. It is awesome how quickly I got these up using Wikka:

[[http://www.knowledgeofasia.com/ | KnowledgeOfAsia]]

and

[[http://www.rsschomp.com/ | RSSChomp]]


More about me here: [[http://www.ashworthdigital.com/ | AshworthDigital]]