Zend_Service_Twitter looks like it will be fairly comprehensive, but it's not in the core yet and is probably a little overkill for my simple use case.
I then had a look at Zend_Rest_Client, which seemed to confuse me. I couldn't actually get it to add the parameters I wanted to the call, I guess it's better for interacting with Zend_Rest_Server or fully restful APIs.
To be fair, the manual actually states:
[Warning] Strictness of Zend_Rest_Client
Any REST service that is strict about the arguments it receives will likely fail using Zend_Rest_Client, because of the behavior described above. This is not a common practice and should not cause problems.
So here's some simple code using Zend_Http_Client.
< ?php require_once 'Zend/Http/Client.php'; $http = new Zend_Http_Client('http://twitter.com/statuses/update.xml', array( 'maxredirects' => 0, 'timeout' => 10, )); $http->setAuth( 'twitter_username', 'twitter_password', Zend_Http_Client::AUTH_BASIC ); $http->setMethod(Zend_Http_Client::POST); $http->setParameterPost('status', 'Your status message'); $http->request(); ?>