Well, this is covered in the Step 1 thread, but I'll bite:
Micro: Clinical Micro Made Ridiculously Simple
Path: BRS Path
Histo: don't know a good review book
Embryo: same, although High Yield is pretty good
Neuroanatomy: can't go wrong with High Yield and the Human Brain coloring book
Anatomy: either Chung or the Anatomy Coloring Book; Ridiculously Simple is good as well (for Step 1, not for course review)
Pharm: Lippincott
Biochem: Lippincott
Did I leave anything out?