Magento: Show Products in any page filter by category attribute

<h2>............................. Top Categories .............................</h2>

<?php
$categories = Mage::getModel('catalog/category')
              ->getCollection()
              ->addAttributeToSelect('*')
              ->addAttributeToFilter('top_category',1)
              ->addIsActiveFilter();
              foreach($categories as $_category)
              {
                     $_productCollection = Mage::getModel('catalog/product')
                     ->getCollection()
                     ->joinField('category_id', 'catalog/category_product', 'category_id', 'product_id = entity_id', null, 'left')
                     ->addAttributeToSelect('*')
                     ->addAttributeToFilter('category_id', $_category->getId())
                     ->addAttributeToSort('created_at', 'desc');
                     foreach($_productCollection as $_topproduct)
                     {
                       $modell = Mage::getModel('catalog/product');
                       $topproduct_id = $_topproduct->getId();
                       $_topproduct = $modell->load($topproduct_id);
                       $_img=Mage::getModel('catalog/product')->load($topproduct_id);
                            ?>

<div class="top-category-product">

<div class="top-category-product-name"><?php echo $_topproduct->getName(); ?></div>

<div class="top-category-product-image"><a href="<?php echo $_topproduct->getProductUrl() ?>"><img src="<?php echo Mage::helper('catalog/image')->init($_img, 'image')->resize(200,200); ?>"></a></div>

</div>

                            <?php
                     }
              }
?>

OR

<?php
  $categories = Mage::getModel('catalog/category')
              ->getCollection()
              ->addAttributeToSelect('*')
              ->addAttributeToFilter('top_category',1)
              ->addIsActiveFilter();
       foreach($categories as $_category)
       {
              $_productCollection = Mage::getResourceModel('catalog/product_collection')
                                   ->addAttributeToSelect('*')
                                   ->setOrder('created_at', 'DESC')
                                   ->addCategoryFilter($_category);
              foreach($_productCollection as $_topproduct)
                     {
                       $topproduct_id = $_topproduct->getId();
                       $modell = Mage::getModel('catalog/product');
                       $_topproduct = $modell->load($topproduct_id);
                       $_img=Mage::getModel('catalog/product')->load($topproduct_id);
                            ?>
                     <div class="top-category-product">
                            <div class="top-category-product-name"><?php echo $_topproduct->getName(); ?></div>
                            <div class="top-category-product-image"><a href="<?php echo $_topproduct->getProductUrl() ?>"><img src="<?php echo Mage::helper('catalog/image')->init($_img, 'image')->resize(200,200); ?>"></a></div>
                     </div>
                            <?php
                     }
       }
?>

Or For Distinct Values

<?php 
$categories = Mage::getModel('catalog/category')
->getCollection()
->addAttributeToSelect('*')
->addAttributeToFilter('top_category',1)
->addIsActiveFilter();
foreach($categories as $_category)
{
$_productCollection = Mage::getResourceModel('catalog/product_collection')
->addAttributeToSelect('*')
->setOrder('created_at', 'DESC')
->addCategoryFilter($_category);
foreach($_productCollection as $_topproduct)
{
$topproduct_id[] = $_topproduct->getId();
}
}
$TopProIdArr = array_unique($topproduct_id);
foreach($TopProIdArr as $TopProId){
$modell = Mage::getModel('catalog/product');
$_topproduct = $modell->load($TopProId);
$_img=Mage::getModel('catalog/product')->load($TopProId);?>
<div class="top-category-product">
<div class="top-category-product-name"><?php echo $_topproduct->getName(); ?></div>
<div class="top-category-product-image"><a href="<?php echo $_topproduct->getProductUrl() ?>"><img src="<?php echo Mage::helper('catalog/image')->init($_img, 'image')->resize(200,200); ?>"></a></div>
</div>

<?php }?>