Favored Soul is primarily Cha, Hexblade uses cha for its limited casting and to spell saves, all Marshal Minor Auras use cha, Spellthief does as well. Samurai, cruddy as it is, sort of needs charisma. Spirit Shaman might, I forget. Crusader has some definite uses for charisma, though it doesn't need it. If using Psionics, there's the Wilder. Tons of prestige classes add uses for a good charisma, and any template that adds spell-like abilities or Su abilities that provide a saving throw benefit from a good charisma, generally.