Beating the Second Law
Yihon Ding has an interesting blogpost taking analogies to the laws of thermodynamics and why this means trouble for the Semantic Web.
I disagree in one aspect: I think it is possible to invest the amount of human power to the system and to still keep it going. I can't nail it down exactly -- I didn't read "Programming the Universe" yet, so I can't really discuss it, but the feeling goes along the following lines: the value of a network increases superlinearly, if not even quadratic (Metcalfe's Law), whereas the amount of information increases sublinearly (due to redundancies in human knowledge). Or, put it in another way: get more people and Wikipedia or Linux gets better, because they have a constrained scope. The more you constrain the scope the more value is added by more people.
This is an oversimplification.
Blogging from an E90
England eagerly lacking cofidence