The Legal Theory Bookworm recommends Liberalism and Distributive Justice by Samuel Freeman. Here is a description:
Samuel Freeman is a leading political philosopher and one of the foremost authorities on the works of John Rawls. Liberalism and Distributive Justice offers a series of Freeman's essays in contemporary political philosophy on three different forms of liberalism-classical liberalism, libertarianism, and the high liberal tradition--and their relation to capitalism, the welfare state, and economic justice.
And another recent Rawls-related monograph: Rawls's Egalitarianism by Alexander Kaufman. Here is a description:
This is a new interpretation and analysis of John Rawls's leading theory of distributive justice, which also considers the responding egalitarian theories of scholars such as Richard Arneson, G. A. Cohen, Ronald Dworkin, Martha Nussbaum, John Roemer, and Amartya Sen. Rawls's theory, Kaufman argues, sets out a normative ideal of justice that incorporates an account of the structure and character of relations that are appropriate for members of society viewed as free and equal moral beings. Forging an approach distinct amongst contemporary theories of equality, Rawls offers an alternative to egalitarian justice methodologies that aim primarily to compensate victims for undeserved bad luck. For Rawls, the values that ground the most plausible account of egalitarianism are real equality of economic opportunity combined with the guarantee of a fair distribution of social goods. Kaufman's analysis will be of interest to scholars and advanced students of political theory and political philosophy, particularly those working on justice, and on the work of John Rawls.