I use Berring & Edinger's Finding The Law, 12th ed., for my hardcore legal bibliography class, and Sloan's Basic Legal Research, 3rd ed., for the 1st years-- Sloan is more process oriented and is a departmental choice. I also like Oates' Just Research, and the old warhorse, Cohen & Olson's Legal Research In A Nutshell, which I believe is in its 9th edition.