I\'m trying to figure out how to redirect to a new page (different application, controller, action) and maintain the current POST data.
My app is validating the POST
You can use a Controller _request object
$this->_request->setPost(array( 'someKey' => 'someValue' ));
And then simply use _forward protected method
$this->_forward('yourAction', 'yourController', 'yourModule');
Then, in forwarded controller action just call
$aPost = $this->_request->getPost();