Hacking

Now this one is really cool, it explains in an easy way what hacking is all about, it refers to all the techniques and the tools that you need to test the security of your system and to find the flaws so that you can protect you're computer against hackers i really recomend it to everyone who is interested in computers
download it here

Origami

Personaly origami was a hobby of mine during philosophy lessons in college but this book will make it possible for you to make anything out of paper, helping you impress people at a bar or in a restaurant with nothing but a paper napkin, its a really good time killer ;)

powerpoint

you have probably seen loads of nice powerpoint presentations in you're life and never really known how they done it, well this will help you to become a powerpoint expert in no time

Excel

Have you always wanted to be able to organize you're life thanks to excel but you never really got around to learn how to use it ??
Luckely i have got 2 Ebooks that can really help you out
these first 825 pages will probably be all you need
but heres another book that really pushes the limit of what excel can do

Kamasutra

download the 83page illustrated version of this mythic book here and you will know everything about how to pleasure you're partner