As many others have already stated I really found the Official CEH study guide of great help. In addition the Test King prep was fantastic as the layout is the same as the actual exam + running the practice tests and getting things wrong helped me investigate my weakest areas of knowledge.
I did also purchase the Prep-Logic test which was in my opinion a waste of money. The example tests with the official CEH book are much better.
I would recommend to anyone to download a copy of Backtrack 2 or 3 and learn the tools Nmap, Netcat, Snort etc.
One thing I was really pleased about during the exam is the exam app includes a calculator.
I also got one question which had an exhibit which was totally irrelevant to the question.