Magento Product ID and Attribute value

How to get all the ID of product in one page

$model = Mage::getModel('catalog/product'); //getting product model

$collection = $model->getCollection(); //products collection

foreach ($collection as $product) //loop for getting products
{
    echo $product->getId();

}

How to get the attribute value of any attribute name in any page 

$_Products = Mage::getSingleton('checkout/cart')->getQuote()->getAllItems();

foreach ($_Products as $value){

$item_ID = $value->getProductId();

$_Product = Mage::getModel('catalog/product')->load($item_ID);

$checkfree = $_Product->getAttributeText('your_attribute_code');

echo $checkfree; //to getthe attribute value of free shipping

}