gistfile1.php

<?php
class Inchoo_Edu_Model_Resource_Collection extends Mage_Core_Model_Resource_Db_Collection_Abstract
{
	/*
	 * Collection that always caches all its queries
	 * 
	 */
	protected function _construct()
	{
		$this->_init('inchoo_edu/dummy');
		
		$this->initCache(
			Mage::app()->getCache(),
			'dummy_collection',
			array()
		);
		
	}
	
}

magento-collection-cache.php

<?php
class Inchoo_Edu_Model_Example
{

	public function getCachedCollection()
	{
		//Mage_Core_Model_Resource_Db_Collection_Abstract
		
		$collection = Mage::getModel('catalog/product')->getCollection()
			->addAttributeToSelect(array('name', 'image', 'url'))
			->addPriceData()
			->addUrlRewrite();

		$collection->initCache(
			Mage::app()->getCache(),
			'INCHOO_EDU_PRODUCTS',
			array(Mage_Catalog_Model_Product::CACHE_TAG)
		);
		
		return $collection;
		
		/*
		$websiteCollection = Mage::getModel('core/website')->getCollection()
			->initCache(
				Mage::app()->getCache(), 
				'app', 
				array(Mage_Core_Model_Website::CACHE_TAG)
			)
			->setLoadDefault(true);
		*/
				
	}
	
	
}