Most ordinary users don’t need their digital camera to have more than about 3 or 4 megapixels. Even at that point, the quality of the optics is more important than the number of pixels.
But those who disagree with me, or who aren’t ordinary users, might be interested in the upcoming offering from Seitz:
At 160 Mpixels, taking nearly a GB per image, it dispenses with flash cards and uses a Mac Mini in a satchel instead.
But any temptation I might have had to splash out 29,000 euros on one of these vanished when I realised that it wouldn’t quite fit in my pocket.
Thanks to Frank Stajano for the link.