Just hold home and lock and take a screenshot. Pirating E-Books is going to probably be the easiest thing even on the iPad, and if the screenshot capabilities are removed, then I'm sure someone will make a jailbreak app that does it easier and faster. Sucks for anyone who's trying to make money,but you're right, theres always a way around DRM, and especially when it's something you just look at.
I just want iPhone 4 to have a A4 like processor and a OLED screen for the enhanced battery life. I could care less about the picture quality. All the OLED's I've seen though look way better than the iPhone screen.