Unarmed blows are 1d3 damage I think (Bludgeoning?), + the Strength modifier.
There are gloves such as craftable gloves that range up to +3 Attack Bonus, and there is the Gloves of the Hin Fist +4 (+4 Attack Bonus, 1d4 Sonic Damage), as well as the Lich Claws that deal Negative Energy damage.