On my Kestrel: nothing.
No wedge bag becaue of the aero seat post.
Tubular clinchers. Cell, ID and $5 in the jersey pocket.

On my Cinelli: wedge bag, small Zefal.
Cell, ID and $5 in the jersey pocket.
1 tube, 1 CO2 w/inflator nozzle. 1 lever.
2 allen wrenches for saddle/stem/cables.

Long rides, Cinelli only: wedge bag, small Zefal.
Cell, ID and $5 in the jersey pocket, 2-3 snack bars.
2 tubes, 2 CO2's, inflator nozzle. 1 lever.
2 allen wrenches, Park mini-brute chain tool.

for my next long ride, I'm putting stuff in the SAG vehicle, feeling good about it.