As a newcomer to the world of digital cameras, I'm puzzled about something I keep seeing over and over on all the digital photogrpahy information sites on the Web. The consensus is that digital SLRs make better pictures and have much less noise than point-and-shoot cameras because they have much larger sensors. I'm talking about physical size, not the number of megapixels. (In fact, another thread here graphically shows the size differences. Wow!) But I've never seen an explanation as to why some camera maker hasn't put a big sensor in a point-and-shoot camera. Does anyone know why that hasn't been done? After all, some non-DLSRs are just as big as DSLRs -- i.e., the Panasonic FZ50 and Fujifilm S6000, S9000 and S9100 -- so it doesn't seem that the size of the camera is the limiting factor, because all those cameras have the smaller sensors. I love SLRs, but it seems like a digital SLR is kind of a melding of old and new technology. I mean, with all the technological advances in digital cameras, mechanically operated shutters and mirrors seem kinda out of place.