There are a few new interesting Barbarian related feats in the new NBoF:
http://www.datadeco.com/nbofeats/nbofeats009.html
HEART OF DEFIANCE [Special]
COPYRIGHT 2001, Eric D. Harry
When in a blood frenzy you are impossible to control.
Prerequisite: Rage 1/day, Base attack bonus +3 or higher
Benefit: When enraged you are immune to all forms of fear and all mind-affecting spells and spell-like abilities.
Balance: 4.45 (Purp 4.50, Pow 4.00, Port 4.25, Comp 5.00, Rule 4.50)
TERRIFYING RAGE [Special]
COPYRIGHT 2001, Eric D. Harry
Your rage is terrifying to behold and fearsome to your enemies
Prerequisite: Rage class ability 2/day, Base attack bonus +3 or higher
Benefit: When enraged, all opponents within 10 feet with HD less than your own must make a Will save (DC = 10 + 1/2 Rage class level + Cha bonus) or become shaken (-2 morale penalty on all attack rolls, checks and saving throws) for the duration of your rage. This is an extraordinary ability that only works when you are using your Rage class ability. Its effects also end if you are subdued, restrained, rendered unconscious or slain, or if your opponent moves more than 10 feet away from you. Opponents that succeed in their saving throws are immune to the terrifying effect of your rage for one day.
Balance: 4.40 (Purp 5.00, Pow 4.00, Port 4.33, Comp 4.00, Rule 4.67)