The EU Publications Office maintains a Summaries of EU Legislation page on the EUR-Lex site. It provides straight-forward and easily navigable explanations of the main aspects of EU legislation, policies and activities. Included in the 32 topics covered on the site are: agriculture, education, environment, human rights and justice. There is a search function allowing you to search within summaries. Currently there is a short user survey being run for those interested in providing some feedback.
The library documentation team and the EDC have produced a short information guide to EUR-Lex.