Pretty Tweet is a really simple jQuery plugin that gets the latest tweet from the provided username along with a pretty timestamp and highlighted links, users and hashes.
Make sure both jQuery and Pretty Tweet are both included on the page then simply add an element with an attribute of data-prettyweet=[twitter username].
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
<script src="/js/prettytweet.js" type="text/javascript"></script>
<div data-prettytweet="mlaver"></div>
That is all.