I have uploaded 23modules of the instructional guide for the Certified Ethical Hacking here:
http://www.xyzexploit.com/certified-...picseen#msg229
You will have to register free of charge at the forum to access the download links at the forum
Apart from this we have loads of other internet security related books there too:
Check here for the list:
http://www.xyzexploit.com/hacking-forum/free-ebook-for-new-registrations!!!/msg209/?topicseen#msg209