The most obvious WikiClient is a web browser that talks HTTP to a WikiServer and renders the HTML given to it from the server.
Do you have any options to just send just raw page data along with a LinkBasket??
There's an XmlRpc interface on wikis in the works if anyone's interested. --LesOrchard
WikiPage could be sent with specific MIME Type. Browsers could either use plugin to display this page or save file to disk and open it with preconfigured application that feeds processed data back to browser (which would be seamless action if browser is configured carefully).
I see a problem with bookmarklet - browser may display wikitext as text/plain and not allow any HTML. Besides bookmarklet is not an automatic solution.