Get Cart items in magento

Using checkout session you can find all items that in cart and also get subtotal and grand total of cart

$items = Mage::getSingleton('checkout/session')->getQuote()->getAllItems();

foreach($items as $item) {
    echo 'ID: '.$item->getProductId().'<br />';
    echo 'Name: '.$item->getName().'<br />';
    echo 'Sku: '.$item->getSku().'<br />';
    echo 'Quantity: '.$item->getQty().'<br />';
    echo 'Price: '.$item->getPrice().'<br />';
    echo "<br />";
}

Get total items and total quantity in cart
$totalItems = Mage::getModel('checkout/cart')->getQuote()->getItemsCount();
$totalQuantity = Mage::getModel('checkout/cart')->getQuote()->getItemsQty();

Get subtotal and grand total price of cart
$subTotal = Mage::getModel('checkout/cart')->getQuote()->getSubtotal();
$grandTotal = Mage::getModel('checkout/cart')->getQuote()->getGrandTotal();