The PHP 5.4 MVC with Shoes On: ActiveRecord, User/Session, Generators, SCSS, (Twitter Bootstrap) Integration, Workers, Cron Management, Image Manipulation, Caching, Git Management, Mail & Mail Parsing, OCR, Scraping, Selenium, Mustache, Markdown, Phone & Text Messaging, WebSockets, BitTorrent and much more!
http://ryan-tate.com/linux/upgrading-to-php-5-4-and-mysql-5-5-on-debian-6-squeeze/
also remove password_hash once ya get it upgraded.