Apple Thoughts: Can I Put That on my iPad?

"One of the most surprising questions we get from new iPhone, iPod touch and iPad users is whether they can play songs, watch movies, or read books on their new iDevice if they aren't purchased and downloaded from iTunes Store."

And it couldn't be easier. Open up iTunes like above and find the books folder. Once there, all you have to do is drag and drop the files you want on your iDevice into this folder. Then click on your device to the left side of the screen, go to the Books tab and sync the ones you want on your device. Pretty easy actually.