In the game I run, one of the players is playing a level 9 Barbarian with 22 Strength (when Raging his strength goes to 26) and a +1 Keen Greatsword. Had Heroisom on as well (+2 to hit). In the first round against a 15 HD monster with 20 AC (at the time), the character raged and attacked twice, power attacking for full, getting criticals on both hits.
Normal: To hit: +18/+13 / Damage: 2d6 + 9 + 1 = 2d6 + 10
Raging: To Hit: +20/+15 / +Damage: 2d6 + 12 + 1 = 2d6 + 13
Power: To Hit: +11/+6 / Damage: 2d6 + 12 + 1 + 18 = 2d6 + 31
Critical Damage from two hits: 8d6 + 124 = 156 damage.
That was a pretty sick amount of damage
B