Grab anesthesia secrets too if you are truely interested in the field. It breaks things down nicely.
It also helps to have a little handbook for the OR's. Grab the Handbook of Anesthesiology, its in the current clinical strategies series. Cost about 15 bucks. It has all all the meds in it, doses, mac's, and provides a brief synopsis of most everything from nerve stimulators to respiratory phys.