I just changed the starter on my buddy's 92 Olds Cutlass Supreme. Now I've changed dozens of starters in my day, so I'm fairly sure I did it right. The problem is that after reattaching the battery, the car is getting no power. Actually the only part of the car getting power is the headlights, so i know the battery is good. I've checked all the fuses and even hooked up jumpers to my own car just to see if maybe it wasn't getting enough juice. Any ideas of what the problem may be? I'm stumped, but will go out and tinker with it again once the sun rises.

That's definitely a strange problem. If you checked all the fuses already, I'm not sure where to look other than check to ensure the starter is getting a good ground.

Fusible link, check grounds, check body feed wires and maxi fuses.