Magento block cache examples

gistfile1.php

<?php
class Inchoo_Edu_Block_Template extends Mage_Core_Block_Template
{
	/*
	 * Block caching
	 * 
	 */
	
	protected function _construct()
	{
		parent::_construct();
	
		$this->addData(array(
			'cache_lifetime' => 48*60*60,
			'cache_tags' => array(
				Mage_Catalog_Model_Product::CACHE_TAG
			)
		));
	}
	
	public function getCacheKeyInfo()
	{
		return array_merge(parent::getCacheKeyInfo(), array(		
			(int)Mage::app()->getStore()->isCurrentlySecure(),
			(int)$this->helper('customer')->isLoggedIn()
		));
		
		/*
		return array(
			'CUSTOM_PRODUCT_LIST',
			(int)Mage::app()->getStore()->isCurrentlySecure(),
			Mage::app()->getStore()->getId(),
			Mage::getSingleton('customer/session')->getCustomerGroupId(),
        	
			Mage::getDesign()->getPackageName(),
			Mage::getDesign()->getTheme('template'),
			'template' => $this->getTemplate(),
			'name' => $this->getNameInLayout(),
              	
			Mage::registry('product')->getId(),
		); 
		*/
	}
	
}

magento-block-cache.php

<?php
class Inchoo_Edu_Block_Template extends Mage_Core_Block_Template
{
	/*
	 * Block caching
	 * 
	 */
	protected function _construct()
	{
		parent::_construct();
		
		//yes, this enables cache :)
		$this->setCacheLifetime(false);
	}
	
	
}