The D3100 is newer, for what it's worth. It has LiveView and video capabilities.
The D3100 is intended for beginners, the D80 for more experienced users. The D3100 is easier to learn, the D80 is easier to use once you learn it. The D3100 is lighter, the D80 is more rugged.
The other major difference is that the D3100 does not have an autofocus motor, depending on the lens to have one. This means that some lenses (those not designated AF-S by Nikon) will not autofocus on the D3100 while they will on the D80.
The ultimate decision is up to you. Only you can decide which features are most important to you. Also, if you can, try to get your hands on the actual cameras. See which one feels more comfortable to you.
Was in a similar situation a month ago. (Eventually, I bought a Canon). However, if you really want a Nikon, you can see the comparison results (D80 vs 3100) by using the search keywords 'compare D80 D3100' in Google. Read the results carefully. Or, you can simply go here: http://camera.downloadatoz.com/comparison,nikon-d3100,vs,nikon-d80.html
BTW, you can also visit : http://snapsort.com/compare/Nikon_D3100-...
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