  We give a detailed review of construction of conserved quantities in extended
theories of gravity for asymptotically maximally symmetric spacetimes and carry
out explicit computations for various solutions. Our construction is based on
the Killing charge method, and a proper discussion of the conserved charges of
extended gravity theories with this method requires studying the corresponding
charges in Einstein's theory with or without a cosmological constant. Hence we
study the ADM charges (in the asymptotically flat case but in generic viable
coordinates), the AD charges (in generic Einstein spaces, including the anti-de
Sitter spacetimes) and the ADT charges in anti-de Sitter spacetimes. We also
discuss the conformal properties and the behavior of these charges under large
gauge transformations as well as the linearization instability issue which
explains the vanishing charge problem for some particular extended theories. We
devote a long discussion to the quasi-local and off-shell generalization of
conserved charges in the 2+1 dimensional Chern-Simons like theories and suggest
their possible relevance to the entropy of black holes.
