I just went through a few hundred feats and these are the ones that came up:
Feats that have a fighter level as a prerequisite:
Weapon Specialization (PHB p. 102, fighter 4)
Greater Weapon Focus (PHB p. 95, fighter 8)
Greater Weapon Specialization (PHB p. 95, fighter 12)
Weapon Supremacy (PHB2 p. 85, fighter 18)
Necropotent (Libris Mortis p. 29, fighter 4)
Feats that depend on a feat that requires a fighter level:
Daring Warrior (Complete Scoundrel p. 76, weapon specialization)
Melee Weapon Mastery (PHB2 p. 81, weapon specialization)
Ranged Weapon Mastery (PHB2 p. 82, weapon specialization)
Slashing Flurry (PHB2 p. 82, weapon specialization)
Driving Attack (PHB2 p. 78, weapon specialization)
Crushing Attack (PHB2 p. 78, weapon specialization)