The monobook theme, available from the ThemeMarket, is an adaption of the
default theme from wikipedia. It uses a complete copy of the css style sheet
from wikipedia, then applies some moin-specific alterations afterwards.
Hopefully this should mean any other style sheets developed for MediaWiki can
be used directly.

Most of the changes involve using the monobook.py file to output HTML that is
closer to the MediaWiki format. These changes are:

* Send all the page headers, footers, and sidebar content at the end of the
  page rather than the beginning. This makes the content more accessible for
  screen readers, and means the content loads before the extra aids.
* Alter the tab list to be a set of actions that can be applied to the current
  page, rather than global site links.
* Move the page links, search bar, and remaining action links to a side bar.
* Remove the actions submission form, and replace with links (I'm not sure if
  this is a good idea - with a large list of actions this can be confusing).
* Add Access Keys and Title tags for common page actions, links and search bar.
* Add a right-to-left patch up to the theme - wikipedia uses a separate css
  file for rtl languages
* Move the page status into the global footer.
* Switch the 'immutable page' text to a 'view raw text' link - this would look
  better if a read only text area was displayed like on wikipedia.

Some other notes:
* Not sure yet how many customizations may be broken - the custom page headers
  and footers aren't emitted currently.
* Includes support for SinglePageSlideShows.
* The page editor form will look bad if a patch for
  MoinMoinBugs/PageEditorIgnoresThemeFooter is not applied.
* If your page logo is smaller than the one at wikipedia, try adjusting the
  line #column-one { padding-top: 160px; } in monobook.css