this is very simple example what you can with "JSON feeds".

Function.prototype.bg = function(ms){
	this.PID = setInterval(this,ms);
	return this;
}
Function.prototype.kill = function(){
	clearInterval(this.PID)
}
String.prototype.onReady = function(func){
	var str = this;
	return function(){
		try{
			eval("var res=("+str+")");
			if(res){
				arguments.callee.kill();
				func()
			}
		}catch(e){
		}
	}.bg(10)
}
function load(user){
	"Delicious.posts".onReady(feed_onload);
	var s = document.createElement("script");
	s.src = "http://del.icio.us/feeds/json/"+user;
	s.charset = "utf-8";
	document.body.appendChild(s);
}

// http://del.icio.us/doc/feeds/json/
function feed_onload(){
	var ul = document.createElement('ul')
	for (var i=0, post; post = Delicious.posts[i]; i++) {
		var li = document.createElement('li')
		var a = document.createElement('a')
		a.style.marginLeft = '20px'
		var img = document.createElement('img')
		img.style.position = 'absolute'
		img.style.display = 'none'
		img.height = img.width = 16
		img.src = post.u.split('/').splice(0,3).join('/')+'/favicon.ico'
		img.onload = showImage(img);
		a.setAttribute('href', post.u)
		a.appendChild(document.createTextNode(post.d))
		li.appendChild(img)
		li.appendChild(a)
		ul.appendChild(li)
	}
	document.getElementById('container').appendChild(ul)
	delete Delicious.posts;
}
function showImage(img){ return (function(){ img.style.display='inline' }) }