I keep this legal dictionary at my right hand on my desk and refer to it almost daily. It is a perferct legal dictionary for non-lawyers.
I'm not a lawyer, but have been involved with litigation as a plaintiff and am training as an expert witness. Sometimes it's helpful to know what "voir dire" and "subpoena duces tecum" mean. Even for somebody who's studied Latin and French, lawyers sometimes pronounce things differently than you'd expect - and this dictionary has helped.
I also appreciate having a copy of the constitution in the back, as well as a guide to the judicial system. Included is a bare-bones outline of criminal and civil procedure which will be helpful for the layperson. The appendix also has lists of important cases and important laws (can you remember Marbury vs. Madison from high school civics?).
I know that Black's Law Dictionary, Eighth Edition (Black's Law Dictionary (Standard Edition)) is the standard, but you can't beat this dictionary for its price, size, and coverage.