Smallest Federated Wiki bookmarklet

gistfile1.js

javascript:
(function (main) {
  var host = document.location.host
    , home = window.prompt('Open these pages from what origin server:', main)
    ;
  if (!home) return;
  document.location = 'http://' + home + document.location.pathname.split('/').map(
    function (i) {
      if (i === 'view') return host;
      if (i === home) return 'view';
      return i;
    }
  ).join('/');
})('fed.wiki.org');

To use this just set the target of a bookmark to the script. If you want a different default server, replace 'fed.wiki.org' at the end with the server you most often rebase to.