With November's subject test fast approaching (panicpanicpanicpanicpanic!), I'm curious to know what you're using to study besides run-of-the-mill study books and websites (i.e. Kaplan, Princeton Review, &c). Here are a few of my favorites:
The Facts on File: Dictionary of Classical, Biblical, & Literary Allusions, by Abraham Lass, David Kiremidjian, and Ruth Goldstein. Each entry is short, to the point, and easy to remember.
A Glossary of Literary Terms, by M. H. Abrams. It's good for those who haven't had much exposure to theory, or who need to brush up on literary terminology.
I Always Look Up The Word Egregious, by Maxwell Nurnberg. It's "the vocabulary book for those who don't need one."