I wrote a small JavaScript a couple of years ago that grabbed a users (mine) most recent tweet and then parsed it out for display including links, date etc.
It used this
As you can see in the documentation, using the REST API you'll need OAuth Tokens in order to do this. Luckily, we can use the Search (which doesn't use OAuth) and use the from:[USERNAME]
operator
Example:
http://search.twitter.com/search.json?q=from:marcofolio
Will give you a JSON object with tweets from that user, where
object.results[0]
will give you the last tweet.