Facebook delete all apps, quite uggly.

gistfile1.js

// Assuming you have Jquerified the page
// http://www.learningjquery.com/2009/04/better-stronger-safer-jquerify-bookmarklet

function deleteApp(tab, index) {
  tab[index].click();
  setTimeout(function() {
    $jq("input[name=remove]").click();
    setTimeout(function() {
      $jq("input[name=ok]").click();
      if (tab[index + 1]) {
        deleteApp(tab, index + 1);
      }
    }, 2000);
  }, 2000);
}

deleteApp($jq(".fbApplicationsList li .fbSettingsListItemDelete input"), 0);