Yes, it will fit. However, you will still need to see if the lens you have has or does not have features like autofocus or CPU connectors that will carry all the info that your camera needs... If it is a Nikon Lens it will work fine. So will others like Sigma, Tamron and Tokina. Carl Zeiss may not give you all the functions but will work in manual mode.
Online retailers such as Digital Rev, Amazon and Ted's Cameras stock lenses suitable for the Nikon D80. Compatible lenses include the Nikon 55 - 200 VR and the Nikon 70 - 200 f2.8 VR.
Yes. Any lens that works with a D60 will work the same or better on a D7000.
The D60 is much lighter and smaller. It is better if you mostly shoot with Auto or Program Mode The D80 (and D90) is heavier and bigger but has better controls for manual adjustment and Autofocuses with older lenses
NO. Considering the entire package, together with the availability of lenses at the right ranges... I will go for Canon any time.
the d7000
Nikon stopped producing the D80 in August 2008 as it was replaced by the D90 :)
Generally, no. Each manufacturer has proprietary mounts for their lenses and, for example, Nikon lenses will not fit a Canon and so on. There are aftermarket lenses made to fit various cameras, but you need to specify the make and even sometimes the model of the camera in order to get a mount that fits.
All canon EF and EFS lenses fit on all canon dslr's
The AF 'A' Mount Minolta lenses work on the Sony, also sigma and tamron do a range of lenses to fit Sony Alpha models.
Any canon ef or efs lenses will fit on all of canon's dslr
Theres a bunch of comparison tests out there for these two models. Check more at http://alatest.com/canon_eos_400d_digital_rebel_xti/digital_slr_cameras/expert_reviews/pe-34087417,248/ Many expert review sources claim the EOS 400D to have better color accuracy and high ISO dynamic range, where as the D80 has better autofocus and build quality. I would consider what existing equipment you already have and what you aim to do with the camera long term. Both have the capacity to be more than just an entry SLR and especially the D80 can be an appropriate backup body for most prosumers out there.