I tossed together a silly WordPress plugin to special-case links into [[leuksman|my wiki pages]] such as my [[gimp mac helper]] tools, as well as to MediaWiki’s bug tracker (eg, bug 1) and SVN repository (r12345 was nice).
SVN anonymous checkout: http://svn.wikimedia.org/svnroot/mediawiki/trunk/silly-regex-linker/
Only useful if you’re me at the moment, but maybe I’ll generalize it for fun.