-I did with my D70 using a laptop and Nikon Capture with USB cable. It looks like the D80 has the option to use a MC-DC1 cable so surely there is some way to connect an interval timer to that plug. Some kind of crank-up toy that flips around & bumps the button on the MC-DC1

-Something like this: http://www.mediapoland.com/eos/Interval_Timer_TM-1.htm designed for super-8 movie cameras...

-How 'bout the one Nikon makes: http://www.bhphotovideo.com/c/product/407310-REG/Nikon_4917_MC_36_Mul...

-Apparently the D80 & D70s take a MC-DC1 http://www.amazon.com/Nikon-MC-DC1-Remote-Digital-Cameras/dp/B000A22V6Y
"4-pin remote control" ...which looks more like a headphone jack from that picture, though it's hard to tell.