Script

jQuery(function(){
    $.getJSON("http://twitter.com/statuses/user_timeline/h2ham.json?callback=?",function(data){
        $('p','#demo').remove();    
        $('#demo').append('<ul/>');
        $.each(data,function(i,items){
            $("<li/>",{
                text:items.text
            }).appendTo('ul','#demo');
            if ( i == 4 ) return false;
        });
    });
});

HTML

<div id="demo">
<h4>@h2hamのつぶやき</h4>
<p><img src="images/loading.gif" width="32" height="32" alt="" /></p>
</div>

Demo