I took it in 2009. Unless you are just amazingly disciplined, I'd advise you to take a course. I had TWO 500+ page GMAT prep books, and I still couldn't concentrate enough to use them. When I took the prep course, I would use the practice tests in the prep books to give myself extra practice.

PM me your email address, and I'll forward these books to you. They are in PDF form, so if you have unlimited access to a printer (i.e., work ), here is over a 1,000 pages of prep-- for free.