Definitely worth a quick mention. The Oxford English Dictionary, otherwise known simply as the OED, can be accessed for free until February 5. This gives you access to 600,000 words, 3 million quotations, over 1000 years of English. In brief, the authority on the English language. To access the dictionary, simply login with trynewoed as both the username and password.
Note: Kaplan Publishing has extended its free ebook offer until January 17. If you know anyone getting ready to take the SAT, GRE, LSAT, etc., then please send them to this page for more information.