Hmm, not so much new features, just generally improved functionality by removing uneeded functionality. The following are known to be axed: -Register Globals -Safe Mode -Magic Quotes Which should'nt really effect much as these were deprecated. However with these 'improvements' their comes some downfalls: -Bug/exploit -> http://www.offensive-security.com/b...r_transliterate-0day-buffer-overflow-exploit/ -Is known to be the slowest PHP version