Twitter provides a couple of scripts that need to be included in your code.  It’s probably best to add them right before the </body> tag so the rest of the page loads first.  Go ahead and add them:

<script src="http://twitter.com/javascripts/blogger.js" type="text/javascript"></script>

<script src="http://twitter.com/statuses/user_timeline/your_username.json?callback=twitterCallback2&count=1" type="text/javascript"></script>

Edit the src attribute of the second script to replace “your_username” with your Twitter username. If you would like to show more than just the latest post, you can change the number where it says “count=1″ to reflect how many posts you would like to show (eg. count=2, count=3, count=4).

Now you need to place this code in your markup where you want the tweets to show up:

<div id="twitter_div"><ul id="twitter_update_list"><li> </li></ul></div>

Your tweet(s) will be added to this div automatically. Style the Twitter div with some CSS and you’re good to go!