Magento: Some important functions

echo $this->getUrl('mypage');

echo $this->getSkinUrl('images/yourimage.gif');

echo $this->getProductData()->getProductUrl();

echo $this->htmlEscape($this->getProductData()->getName());

echo $this->getLayout()->createBlock('cms/block')->setBlockId('YOURBLOCKID')->toHtml();

echo $this->getCurrentCategory()->getImageUrl();

echo $this->IsTopCategory();

echo $this->getCurrentCategory()->getDescription();

echo $this->getProductListHtml();

echo $this->getCmsBlockHtml();

echo $storeId = Mage::app()->getStore()->getId();

echo $storeName = Mage::app()->getStore()->getName();

echo $storeCode = Mage::app()->getStore()->getCode();

echo $websiteName = Mage::app()->getWebsite()->getName();

echo $sessionId = Mage::getModel('core/session')->getSessionId();

echo $customerId = Mage::getModel('customer/session')->getCustomerId();

echo $vistitorId = Mage::getModel('core/session')->getVisitorId();