Harriers. I don't know if ordinary fighter jets would even benefit from a ski jump, but the ski jump is to make up for how short the deck is (generally too short to launch a jet).
See the links below; compare "max takeoff weight" for vertical takeoff ("VTO") and rolling takeoff (also called short takeoff, or "STO").
http://en.wikipedia.org/wiki/BAE_Harrier_II#Specifications_....
http://en.wikipedia.org/wiki/McDonnell_Douglas_AV-8B_Harrier...