I have the Cisco Press ICND1 and ICND2 books, which include a practice exam engine from Boson.com. When going through the practice exam a lot of the questions are long and detailed.
I also have the CCNA Practice Questions Exam Cram book by Jeremy Cioara ( http://www.amazon.com/CCNA-Practice-Questions-Exam-640-802/dp/0789737140/ref=pd_bbs_2?ie=UTF8&s=books&qid=1214784236&sr=8-2 ). When going through the practice exam from this book the questions are much more direct, read faster, and are generally easier.
Of course both of these are meant to prep you for the CCNA exam, but I find the Cisco Press practice exam significantly more challenging than Cioara's.
Has anyone used either of these for study and can compare them to the 640-802? Which one is closer to the actual exam environment? Maybe there is another practice exam I should be looking into? Thanks.