As explained in many guidelines about Web usability, MediaWiki should never have a link that points to the current page. In the content of articles, this is already the case: if we are on the article called "London", any link to "London" would produce <strong class="selflink">London</strong>.
Unfortunately this is not the case for the left side menu, and the home page.
As explained in http://www.useit.com/alertbox/20031110.html, section n°10:
Active links to current pages cause three problems:
If they click it, a link leading to the current page is an utter waste of users' time.
Worse, such links cause users to doubt whether they're really at the location they think they're at.
Worst of all, if users do follow these no-op links they'll be confused as to their new location, particularly if the page is scrolled back to the top.
Homepage links on the homepage typically result from using a universal navigation bar that includes "home" as an option. Fine. But when users are on a page that's featured in the navbar, you should turn off that option's link and highlight it in such as way that indicates that it's the current location.
Thanks :-)
Version: unspecified
Severity: enhancement