The mercurial hudson plugin should also support repository browsing for Kiln (http://www.fogcreek.com/Kiln/)
Attached is a svn patch off of 1.25 tag that includes kiln support.
Version 1.28 is released.
Code changed in hudson
User: : mfriedenhagen
[FIXED JENKINS-5835] Include repository browsing support for Kiln (patch by timmytonyboots).
Fixed with http://fisheye.jenkins-ci.org/changelog/Hudson?cs=29420, should go into version 1.28.
Sorry, I don't have commit privileges.
the patches look good to me, if you have SVN access I would be glad if you just committed your changes to the trunk and updated http://wiki.jenkins-ci.org/display/JENKINS/Mercurial+Plugin accordingly.
Added a KilnHG unit test.
as far as I can see your patch does not include a test, please take a look at those provided for the other browsers.