There is not much you can do,
the only thing I would suggest is to use `concat` instead of `push`, this way you can keep re-using `commonLogs`, and maybe have 1 `commonLogs` per group.

So

      var commonLogs = [ [] ];
      commonLogs[1]  = ["DCSext.common1","common1"];
      commonLogs[2]  = commonLogs[1].concat( ["DCSext.common2","common2"] );
      commonLogs[3]  = commonLogs[2].concat( ["DCSext.common3","common3"] );

Then you can

    (function(){

      $("#a", "#main").bind("mouseover", function(){
              var id1 = $("#one").text(),
                  args = commonLogs[2].concat["DCSext.title","one", "DCSext.ti", id1];
              dcsMultitrack.apply(this, args);
      });

      $("#b", "#cool").bind("click", function(){
           var id2 = $("#two").text(),
               args = commonLogs[2].concat["DCSext.title", "two", "DCSext.some", id2];
               dcsMultitrack.apply(this, args);
      });

      $("body").delegate("a", "click", function(){
         var id3 = $("#three").text(),
             args = commonLogs[2].concat["DCSext.new", "what", "DCSext.where", "us"];
             dcsMultitrack.apply(this, args);
      });

    }());