gybegirl - I don't agree. It's true, children learn an enourmous amount in the first 6 years of their lives, but they learn best by being encouraged in things they show an interest in. Chatting, reading to them, playing ball, board games, building, drawing ... However, I feel a good number of 4 year olds are wasting their time trying to blend letters and add numbers, if they could be enhancing their language skills by being told stories and re-enacting them in play or counting and sharing their sweets/grapes amongst their friends etc... I just don't see why they need to read at that age.
In most scandinavian countries children don't start reading and writing (formal learning) until age 7, although some are taught to read but only if they want to learn. Children there seem to view school more positively than in the UK and are by no means behind by the time they are in secondary education. There used to be a lovely film on TeachersTV about Kindergarten in Sweden (not sure if it's still there).