I'm a complete noob to the photography scene. The two cameras listed in the title are the ones that have caught my eye first. The problem I'm having is the P80 has a higher megapixel and zoom feature but is not SLR whatever that is. The D40 seems to be the cheapest Nikon SLR camera but it only has a megapixel rating of 6.1.
The D40 will blow the p80 "clean out of the water". It's not even a fair comparison.
Don't worry about "mega pixels". That is a marketing term that really means nothing. It tells you how may little squares the sensor has been divided into. What you really care about is how large each square is. The SLR has a much larger sensor that is less finely divided, so yuo get much larger pixels. Larger pixels means less noise and better low light performance.
What is an "SLR". It is a camera which an optical viewfinder that loks out through the same lens that takes the picture. You see a perfect picture of the sunject, NOT the subject on an LCD screen but the actual subject.
SLR also allow you to change lenses so your "zoom" ratio can be literally
anything you want it to be, just buy the correct lens