Handbooks are excellent sources for summaries on the latest research on topics.
Oxford Handbooks Online provides introductions and a critical survey of the current state of scholarship on major topics. The handbooks date from 2004 to present. Subject areas include Criminal Justice, Law, Music, Political Science, History, Religion, Psychology, Literature and Classical Studies.
Online access to the Routledge Handbooks, which are reference books that provide handy information about topics in a certain field of study. PDF downloads available at the chapter level. Broad subject coverage includes social science, science, education, psychology, and the humanities.