Canon just came out with a new 8 megapixel digital SLR. 6M is plenty for 12×18″, I’ve found (say about 8″ or further away when viewing).
In any event, with the Nikon D70 I have, I have now tried in all the various modes with which I’ve done pictures in the past, and it can do the work of 4 35mm cameras all at once and do it better. It can do shots I couldn’t even dream about before whether its portraits, action, astrophotography, night shots, dim indoor shots, posters etc. I seriously doubt I will be using my (otherwise very nice) 35mm camera any more. Instant-feedback, 4 frames/sec continuous shooting, it’s all great.
Of course, high-performance photography is one of those disenchanting activities the powers-that-be are so afraid of so 6 O’clock-news-faithful should steer clear, and likely have already been programmed to do so (so be warned).