Dose the nikon d80 camera body have a built in lens motor?

Yes it does. The crank shaft gear can be seen at the 7:00 position on the cameras lens mount.

Which means all AF lenses designed for Nikon AF (Tamron, Sigma, Tokina, etc) will operate just fine.

Yup. Go Clavestone!

yes it does hav a built in lens motor unlike the nikon D40/40x

it does have one

Yes it does - but why are you asking?

Do you own Nikon AF lenses that require it?

Are you planning to take advantage of the used Nikon lens market and need a camera compatible with Nikon AF lenses?

Is there a lens in the Nikon catalogue that you are planning to buy with the D80 that requires it?

I suspect that you are comparing the Nikon D40 and D80. The D40 is only autofocus compatible with AF-S hypersonic focus lenses. (You can manually focus with all other lenses.) However, AF-S is undoubtedly the direction Nikon is going to to go with future lenses and their current selection covers most photographers needs.

AF-S lenses are faster to focus, more accurate to focus, quieter and require less battery power. Even with a D80, your preference would be to own AF-S lenses anyway.

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Disclosure: I am the owner of www.lenslenders.com lens rentals in Canada.