Get product id and product type in magento?

<?php if( $_product->getTypeId() == 'simple' ): ?>
//your code for simple products only
<?php endif; ?>

<?php if( $_product->getTypeId() == 'grouped' ): ?>
//your code for grouped products only
<?php endif; ?>

So on. It works! Magento 1.6.1, place in the view.phtml

Try below code to get currently loaded product id:

$product_id = $this->getProduct()->getId();

When you don’t have access to $this, you can use Magento registry:

$product_id = Mage::registry('current_product')->getId();

Also for product type i think

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

$productType = $product->getTypeId();

you can get all product information from following code

$product_id=6//Suppose
$_product=Mage::getModel('catalog/product')->load($product_id);


    $product_data["id"]=$_product->getId();
    $product_data["name"]=$_product->getName();
    $product_data["short_description"]=$_product->getShortDescription();
    $product_data["description"]=$_product->getDescription();
    $product_data["price"]=$_product->getPrice();
    $product_data["special price"]=$_product->getFinalPrice();
    $product_data["image"]=$_product->getThumbnailUrl();
    $product_data["model"]=$_product->getSku();
    $product_data["color"]=$_product->getAttributeText('color'); //get cusom attribute value


    $storeId = Mage::app()->getStore()->getId();
    $summaryData = Mage::getModel('review/review_summary')->setStoreId($storeId)  ->load($_product->getId());
    $product_data["rating"]=($summaryData['rating_summary']*5)/100;

    $product_data["shipping"]=Mage::getStoreConfig('carriers/flatrate/price');

    if($_product->isSalable() ==1)
        $product_data["in_stock"]=1;
    else
        $product_data["in_stock"]=0;


    echo "<pre>";
    print_r($product_data);
    //echo "</pre>";