Screenshot of Special:PasswordReset on mediawiki.org as of September 5, 2012
The form at https://www.mediawiki.org/wiki/Special:PasswordReset is currently kind of confusing. I'm attaching a screenshot, but it has a few obvious issues.
The intro to the Special page reads "Enter one of the pieces of data below" while the intro to the form itself reads "Complete this form to receive an e-mail reminder of your account details." This is kind of confusing. (Plus the first message really ought to be properly punctuated!)
I think a form like this might be better off as two fieldsets, but I'll leave that to the design folks to work on/figure out.
I've added an attachment of a screenshot of the current form at https://www.mediawiki.org/wiki/Special:PasswordReset. This bug is related to bug 34386.