Did you search google? It will be a much valuable use of your (and our) time than waiting for responses on here.
These came up from the same search and might be in more layman terms.
http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00Exiv
http://www.shutterbug.com/equipmentr...lrs/1205nikon/
http://www.kenrockwell.com/nikon/d80/vs-d70.htm
Also, don't rule out the Canons. Go into your local camera store, hold them, and talk to the person behind the counter.