This resource letter has appeared online in the March issue of the American Journal of Physics. It is written by one of the leading experts in this field, Eric Linder. If you don't have access to AJP, you can get the arXiv preprint of this paper here. Reading the abstract alone should be sufficient motivation on why anyone would want to keep a copy of this paper.
Abstract: This Resource Letter provides a guide to the literature on dark energy and the accelerating universe. It is intended to be of use to researchers, teachers, and students at several levels. Journal articles, books, and websites are cited for the following topics: Einstein's cosmological constant, quintessence or dynamical scalar fields, modified cosmic gravity, relations to high energy physics, cosmological probes and observations, terrestrial probes, calculational tools and parameter estimation, teaching strategies and educational resources, and the fate of the universe.
 E. Linder, Am. J. Phys. v.76, p.197 (2008).