The D80 and P80 are not in the same category. The P80 is an "Advanced Point and Shoot" camera, and the D80 is a "Digital Single Lens Reflex (DSLR)" camera. It would be like comparing apples to coconuts.
Here is a detailed review of the P80
Steves Digicams - Nikon Coolpix P80 - Hands on Review
And here is a detailed review of the D80
Steves Digicams - Nikon D80 SLR User Review
Hope this helps.
Chris