Using C#, preferably Asp.net MVC I want to implement a wiki solution which consists of a unique markup language and article display. However I also want to provide standard wiki features such as RSS, Versioning, ext.
What existing wiki would you recommend me to base upon?
I'm not aware of a mature ASP MVC wiki, but in the asp.net webforms area screwturn is my favourite.
screwturn.eu is your friend. It go all the other tricky stuff solved (and there is a lot of that!)
You can easily replace the page formatter pipeline (core/FormattingPipeline.cs in screwturn) or more simply just add custom formatters
MVC is nice but shouldn't be a requirement for a wiki which is effectively just one page (default.aspx in screwturn's case)?
You should be able to use Url re-writing to make each page have a pretty URL, this is how MVC framework work any ways
e.g. site.com/pageName > site.com/pageName.ashx