I've printed a few shots from my 10.2MP 400D up to A1 size (roughly 23 x 33 inches) and they have looked fine. Of course, this is assuming you're not squinting at them up close but standing back far enough to view the entire picture without having to roll your eyes around! Even close up, you need to look very closely to make out pixels. I suppose what different people consider acceptable is based on how close their eyes are to the picture. As Daniel says in his post, a movie theatre picture looks great, but thats because a viewer isn't going to be staring at a 1 foot square section of the screen from 18 inches away!