A WikiWikiWeb works best if as many people as possible help to deliver or improve content. According to experience most people only read in a wiki and very few are editing. So it is a good idea to attract a lot of traffic in a wiki. Search engines can help you to achieve this aim. Search_engine_optimization (SEO) is quite sophisticated, but there are also some quite easy to realise rules.
In the Google Webmaster Tools you can chose wich is the Main-Domain.
You have to take care that the AccessibleMoin do not suffer by the optimization.
It is a good idea to put important words in a heading. This is a task for the editor of a page. In the newest Revision of MoinMoin the title of a page is marked as h1. This is fine.
A good tool to check the Headings is the web developer toolbar of firefox: Information | View Document Outline.
The page should begin with content. The Logo and the Navigation-Links should moved in the source-code of a site to the end. It can be showed on the top with CSS.