"No Money
With everything free there would be no reason to have money, credit or barter. This would eliminate most of the bookkeeping and many businesses. Many jobs would become unnecessary, e.g. most accounting, sales, advertising, banking, credit companies, insurance, armies, tax & bill collectors, government, politicians and lawyers."
- this has raises some interesting points.
1) with no-one in a restaurant to clean your table each person who eats there is expected to clean their own table - or when you stay in a hotel, as nobody wants to clean the toilets you are expected to do it yourself (and everyone does it because they know there will be no nice hotels to stay in if they don't) of course hotels are all free, so you are expected to contribute to if you are staying there.
2) Lawyers are still needed, as are judges. You may not pay them (they just argue the law because it is fun to work out what is just - as it is fun to work out how the rules apply to illegal orders in diplomacy - see another thread)
Lawyers are needed to ensure the law is fairly enforced, that people can have a fair trial. Unless the law is simple enough for all members of society to understand (and they can defend themselves)
3) Armies for the same reason above about stealing being impossible or not. They don't need to exist and the neighbouring armed tribe will come and take everything when they have a scarcity - that is why armies were developed.
OK, i haven't read it all, and some ideas are interesting (like you could make things free where a surplus can be created, for example temporary accomadation - in fact any city would benifit in tourism if it had some free rooms to stay in - you could even put a windmill on the roof, and use it to power a computer to handle the bookings - no need for a human to run it i think - HOWEVER you run into a new problem when people don't keep their booking because it doesn't cost them anything... a different set of problems even where it has potential, so not a Utopia.