Zend Form 1.12 usando Twitter Bootstrap e Decorators.

Usuarios.php

<?php

class Forms_Usuario extends Zend_Form {

    public function init() {

        $this->setMethod('post');
        $this->setAttribs(array(
            'class' => 'form span9',
            'name' => 'form_usuarios'
        ));

        $nome = $this->createElement('text', 'nome', array(
                    'label' => 'Nome:',
                    'class' => 'span4',
                    'placeholder' => 'João dos Santos'))
                ->setRequired(true)
                ->setAttrib('required', '')
                ->addValidator('StringLength', false, array(4));
        $this->addElement($nome);

        $email = $this->createElement('text', 'email', array(
                    'label' => 'E-mail:',
                    'class' => 'span4',
                    'placeholder' => 'joao@anic.in'))
                ->addValidator('EmailAddress')
                ->setRequired(true)
                ->setAttrib('required', '')
                ->addValidator(new Zend_Validate_Db_NoRecordExists(
                array(
            'table' => 'hr001',
            'field' => 'email',
        )));
        $this->addElement($email);

        $login = $this->createElement('text', 'login', array(
                    'label' => 'Login:',
                    'class' => 'span4',
                    'placeholder' => 'joao'))
                ->setRequired(true)
                ->setAttrib('required', '')
                ->addValidator('StringLength', false, array('min' => 3, 'max' => 50))
                ->addValidator(new Zend_Validate_Db_NoRecordExists(
                array(
            'table' => 'hr001',
            'field' => 'login',
        )));
        $this->addElement($login);

        $senha = $this->createElement('password', 'senha', array(
                    'label' => 'Senha:',
                    'class' => 'span4',
                    'trim' => true,
                    'placeholder' => 'Senha de 3 a 15 caracteres'
                ))
                ->setRequired()
                ->setAttrib('required', '')
                ->addValidator('StringLength', false, array(3, 15));
        $this->addElement($senha);


        // grupos
        $grupos = new Application_Model_DbTable_Grupo();

        $grupo = $this->createElement('select', 'grupo_id', array(
                    'label' => 'Grupo:',
                    'class' => 'span4',
                    'MultiOptions' => $grupos->getPares()))
                ->setAttrib('required', '')
                ->setRequired(true);
        $this->addElement($grupo);

        $fone = $this->createElement('text', 'fone', array(
                    'label' => 'Fone:',
                    'class' => 'span4',
                    'placeholder' => '(00)0000-0000'))
                ->addValidator('StringLength', false, array(10))
                ->setRequired(true)
                ->setAttrib('required', '');
        $this->addElement($fone);

        $ativo = $this->createElement('select', 'a', array(
                    'label' => 'Ativo:',
                    'class' => 'span1',
                    'MultiOptions' => array('Y' => 'SIM', 'N' => 'NÃO')))
                ->setRequired(true)
                ->setAttrib('required', '');
        $this->addElement($ativo);

        $submit = $this->createElement('submit', 'Salvar', array(
            'value' => 'Salvar',
            'class' => 'btn btn-primary'));
        $this->addElement($submit);
        
        // Configurando os Decorators
        $this->setElementDecorators(array('ViewHelper', 'Errors', 'Label'));

        $this->setDecorators(array('FormElements', 'Form'));

        // Setando os decorators de cada campo
        $nome->setDecorators(array(
            'ViewHelper',
            'Errors',
            'Description',
            array(array('label' => 'label')),
            array(array('class' => 'HtmlTag'), array('class' => 'span4'))
        ));

        $email->setDecorators(array(
            'ViewHelper',
            'Errors',
            'Description',
            array(array('label' => 'label')),
            array(array('class' => 'HtmlTag'), array('class' => 'span4'))
        ));

        $login->setDecorators(array(
            'ViewHelper',
            'Errors',
            'Description',
            array(array('label' => 'label')),
            array(array('class' => 'HtmlTag'), array('class' => 'span4'))
        ));

        $senha->setDecorators(array(
            'ViewHelper',
            'Errors',
            'Description',
            array(array('label' => 'label')),
            array(array('class' => 'HtmlTag'), array('class' => 'span4'))
        ));

        $grupo->setDecorators(array(
            'ViewHelper',
            'Errors',
            'Description',
            array(array('label' => 'label')),
            array(array('class' => 'HtmlTag'), array('class' => 'span4'))
        ));

        $fone->setDecorators(array(
            'ViewHelper',
            'Errors',
            'Description',
            array(array('label' => 'label')),
            array(array('class' => 'HtmlTag'), array('class' => 'span4'))
        ));

        $ativo->setDecorators(array(
            'ViewHelper',
            'Errors',
            'Description',
            array(array('label' => 'label')),
            array(array('class' => 'HtmlTag'), array('class' => 'span4'))
        ));

        $submit->setDecorators(array(
            'ViewHelper',
            array(array('class' => 'HtmlTag'), array('class' => 'actions span8'))
        ));

    }

}