If I decided to write my own ebook on programming and put it up on iBooks, would I be allowed to plug it every time someone asks questions about how to do something that I cover? I'm thinking once I finish my first 3D game here in the next few months, I'd like to write a book that explains everything I've learned over the past decade that came together in making my game. The idea is other people will be able to learn what I learned in ten years in ten months instead. I figure it'll cover just enough C, Obj-C, C++, Xcode, Blender, GIMP, and Ogre 3D for someone to make a game comparable to mine. (Maybe I'll teach some sound stuff in the book, too... IDK, my game is silent right now because I haven't yet learned how to make my own music/sound effects and have them not suck.) I know people end up plugging books they liked for learning a topic all the time... I'm not sure if the forum rules somehow forbid plugging a book that they wrote themselves.