Damn Cool Algorithms: Cardinality Estimation
A minor nitpick... 'cardinality' in mathematics refers to a set of infinities. The set of all integers has a certain cardinality, which is equal to the cardinality of all rational numbers, but which is smaller than the cardinality of all irrational numbers.<p>"Size estimation" is sufficient; no need to get fancy with words you don't know the meaning of.