Bataille's 3-volume masterwork is the triumph of his life's work in the philosophy of expenditure. For beginners seeking a comprehensive introduction to this most important of 20th century philosophers (a title Foucault bestowed upon Bataille), I recommend reading "Erotism: Death and Sensuality" first, then the three volumes of "The Accursed Share," and finally "The Tears of Eros."
To what has already been written here about "The Accursed Share," I would add a few words about the book's content. Bataille proposes that the sovereign state--that condition of ultimate value, in which we are removed from the world that tallies our value in terms of the work we perform, in which we exist for our own sake--is the secret goal of all humanity. However, this sovereignty is not so much a development of humanity as a return to our lost animal state, a return along the trajectory of self-consciousness that resulted from becoming human. Bataille defines the human as an eternal dialectic between this lost animality and the human world of work and reason.
His masterwork develops ideas that will benefit the fields of study including economics, morality, humanities, politics, aesthetics, Nietzschean philosophy, theology, and ontology, for Bataille elucidates some of the principles that link all these fields together--principles that many of these fields have loathed to discuss for themselves.