the for loop would look something like this:

for(i=0;i<story.length;i++){
titles = story[i].childNodes[0].childNodes;
trace(titles);
}

if you added this to the bottom of my parseXML function it would trace out every title for all the new posts at digg.com. If you replaced the trace with an array it would load each title into the array where you could have full control dynamically. hope that helps