As I seem to preface alot of my articles with, I know this has been around for a long time. Basically it is free tech books you can download, granted they may not be O'Reilly (actually some of them are and O'Reilly has their own free book section), they are free knowledge. And as has been said many times, and will be said many more, knowledge is power.

Also, I am sure most of you also remember that MIT offers many of their courses online for free. True, you do not get any credit for the course, but repeat after me again, knowledge is power. Now quit being lazy and go read something...