About dual wield vs 2h weapons - seems the latter works better.
Considering you need to use short sword to get lesser bab penalty (which lowers your damage and forces you to use "piercing" damage which seems to be the least reliable as far as critter resistances go ) OR to dual wield heavy weapons - which inflict a serious bab penalty (which could be very well used to pump into power attack) the good ol' 2h sword or axe works better.
Situation : 20 strg , dual wield +4 bastard swords. No power attack to offset the bab penalty.
With dual wield you get let's say 4 attacks per round which inflict let's say 15+15+14 (10-19 dam total) + 11 (7-16 dam).
20 str , Massive Halberd of Hate +4.No power attack.
You get 22+22+21 (14-31 dam). Considering you can add the 4 bab you'd lost on dual wield activating power attack - 26+26+25.
On the side note - that halberd has basic 2d8 (!) dam AND vampiric drain 1d4 which is PERMANENT not temporary - which basically heals my barb. Also has extra dam fighting good chars.
The good thing about dual wield is that you can get nice extra stuff from weapons - true - but in most cases those "extras" come at the cost of enchantment level (and we all know what that means). Unless of course you find some really kickass wep - but that happens after 2/3 of the game.
But if my barb can hit critically for 84 damage I don't think I need a short sword that webs the opponent.
IMHO - dual wield is great for fighting spellcasters/archers - greater chance to interrupt their spells/attacks.
And yes - that's pure hypocrisy.
My next party will have a dual wielding char.

Death is what you make of it.
And there are things far worse the death. And I know them all.