Below is the code to get all the active shipping methods.This will return an array of shipping methods which you can enhance further to suit your needs.

public function getActiveShippingMethods()    {
            $methods = array(array('value'=>'','label'=>Mage::helper('adminhtml')->__('--Please Select--')));        $activeCarriers = Mage::getSingleton('shipping/config')->getActiveCarriers();        foreach($activeCarriers as $carrierCode => $carrierModel)        {           $options = array();           if( $carrierMethods = $carrierModel->getAllowedMethods() )           {               foreach ($carrierMethods as $methodCode => $method)               {                    $code= $carrierCode.'_'.$methodCode;                    $options[]=array('value'=>$code,'label'=>$method);               }               $carrierTitle = Mage::getStoreConfig('carriers/'.$carrierCode.'/title');           }            $methods[]=array('value'=>$options,'label'=>$carrierTitle);        }        return $methods;    }2  
     
       
    class     
    Inchoo_Vendor_Model_Activpayment   
      
       
    {
        
      
       
            
    public     
    function     
    getActivPaymentMethods()   
      
       
            
    {
        
      
       
               
    $payments     
    = Mage::getSingleton(    
    'payment/config'    
    )->getActiveMethods();   
      
       
               
    $methods     
    =     
    array    
    (    
    array    
    (    
    'value'    
    =>    
    ''    
    ,     
    'label'    
    =>Mage::helper(    
    'adminhtml'    
    )->__(    
    '--Please Select--'    
    )));   
      
       
               
    foreach     
    (    
    $payments     
    as     
    $paymentCode    
    =>    
    $paymentModel    
    ) {
        
      
       
                    
    $paymentTitle     
    = Mage::getStoreConfig(    
    'payment/'    
    .    
    $paymentCode    
    .    
    '/title'    
    );   
      
       
                    
    $methods    
    [    
    $paymentCode    
    ] =     
    array    
    (   
      
       
                        
    'label'       
    =>     
    $paymentTitle    
    ,   
      
       
                        
    'value'     
    =>     
    $paymentCode    
    ,   
      
       
                    
    );   
      
       
                
    }   
      
       
                
    return     
    $methods    
    ;   
      
       
            
    }   
      
       
    }