Mostly deck screws. I used to use nails most, but since the cordless screw gun came along, I've slowly gone to screws; first drywall screws and now deck screws because they're stronger. I did get away from squareheads though. From time to time I use hinges, drawer slides, and knobs, but screws are way out in front.
I think it would break down like this:
1. Deck screws
2. Drywall screws
3. Hinges
4. Drawer slides
5. Drawer pull knobs
6. Nails (nailer)
7. Picture hooks
8. Cup hooks
9. Angle irons
10. Nails (hammered)
11. 1/2" copper pipe
12. Corner bead
(sorry I didn't feel it was fair to keep the list to 10 items)