partyboy911,
I do not have a script for you, but for a trigger you can pull the last tweet of a user by fetching "http://search.twitter.com/search?rpp=1&from=<username>" and then filter the results from the html. The results are in a li element with a class of "result ". The actual message part is in a div element with a class of "msg".
-edit-
I did notice a similar script to my post on hawkee. With a little modification it can do what you want (at least the trigger part).
http://www.hawkee.com/snippet/5883/
