Lol there's a bit of not miss-information but impractical information going around this thread.
- "But can anyone tell me, why did they make the D80 smaller than the D70s?"
Because they can. As technology improves things get smaller. People like smaller lighter cameras. If you look at the D200 internals and the D80 you'll see both cameras are packed as tightly as possible in their case.
- "As for the megapixel thing. THEY DO NOT MATTER FOR IMAGE QUALITY."
That is plain false. The fact is yes they do, but unlike marketing mantra it is not the only thing that matters. Pixels size, sensor design, and megapixles all matter. There is only so much resampling and upsizing you can do to an image to try and increase the size. Does it matter for 6x4 prints that mummy and daddy make? No. But I have 2 poster sized prints in my room that would not look as good on my old 3mpx camera simply because of the number of pixels. Mind you the more pixels you cram onto a sensor the smaller (noisier and less defined) they get. There needs to be a balance. 10mpx makes sense on APS sensors in SLRs, but not much sense on a 7mm sensor in a small P&S.
- "Read the megapixel myth by Ken Rockwell."
Do yourself a favour and don't read anything on Ken Rockwell's site. Regardless of how people think of him as a photographer, his site is 50% opinion and the other half crap. I mean common he writes reviews on products he has never used and disses products for features he thinks "no professional photographer ever uses". Unless you take identical photos to him take everything on that site with a grain of salt.
- "keep in mind that Nikon has no dust reduction technology"
No they don't, but those companies that do, don't work. I have read lots of crap reviews about those ultra sonic cleaning thingamabobs that some Canon and Olympus models have. Prevention is better than repair. Switch lenses quickly and don't remove a lens during a dust storm. A friend has had a D200 for years (pre-ordered when it was announced) and only uses prime lenses. Even though he switches several times on every expedition he's never once had to try sensor cleaning.