Review of RFID in 2007

From air baggage tags to tagging items of consumer goods, it seems that the clunky approach of writing to the tag at various times during its life had to be retained by most. That means inherent lack of data synchronisation and inherently expensive tags and readers, with read write, password protected chips and so on. Even in large closed systems this is at best questionable given that read only tags perform well at world leader Marks & Spencer in the UK with what will soon be 350 million tags yearly on apparel. Read only tags also perform well in road tolling and many other applications.