Via the Kenyon Review blog, here’s a post at the Oxford UP blog about prepositions, which defends the honor of these little words and points to a new website, The Preposition Project, “a monumental undertaking that systematically describes 673 distinct senses for 334 prepositions in English.”
All I have to add is that when the Little Man was an infant, A used to recite an alphabetized list of the most common prepositions in order to quiet him down for sleep. (She’d memorized it in Catholic grade school.) I will say that he’s always been pretty fluent with them.