The Easiest Way to Learn the Tarot Ever, by Dusty White: off putting title IMO but offers a solid course of instruction in using the cards intuitively
Mystical origins of the Tarot, by Paul Huson: a great book on the tarot's history, and a good reminder to not get hung up on any particular card meanings, as it shows how they evolved.
78 degrees of wisdom, Rachel pollack: well written, great insights.
Complete guide to tarot reversals, Mary Greer: great help with reversals and meanings in general.
Also anything by Joan Bunning. You can basically get all the content of her book Learning the Tarot at her website.