Okay, so with two swords, there isn't a WHOLE LOT you can do. First you make them two short swords, that will mitigate some of your issues. Then you are going to have to go scouting for a source of extra damage on a per attack basis -- sneak attack works great. However, this is a VERY VERY suboptimal combat style that takes an INCREDIBLE amount of effort just to stay relatively competent. You won't ever be a 'high damage' melee character. Here is what person_man says about this style:
"Precision Damage + Lots of Attacks
Pro: Precision Damage (Sneak Attack, Sudden Strike, and Skirmish) provides relatively good bonus damage independent of your BAB. Doesn't penalize your To-Hit or AC (like Power Attack or Shock Trooper). Ambush feats can also add status effects.
Con: Requires a trigger (Flanking and/or Denied Dex or moving 10 ft). Lots of enemies are immune to Precision Damage. Bonus dice of damage aren't multiplied. Damage does not scale as well as other options (Power Attack, Dungeoncrasher, Claws of the Beast, ToB manuevers, etc).
Level of Effort: Intense. You're probably going to want some combination of Two Weapon Fighting feats or Multiweapon Fighting, natural attacks, a Haste effect, and an Attack of Opportunity Combo. You're also going to want to invest in some way to get past Precision Damage immunity, such as Dragonfire Strike, alternate class features, or wands. And you're going to want Ambush feats to add status effects
Best Used Against: Anyone who isn't immune.
Commentary: If your goal is to be excellent at melee, then don't rely on Precision Damage. The return on investment is never going to be as good as a Power Attack combo or a scaled power related combo (psionics, ToB, incarnum, etc). However, if your goal is to an excellent Skill Monkey and you don't want to play a Factotum or Beguiler or Incarnate, then you'll probably need to learn how to optimize this. Here's a good mini-guide
http://www.giantitp.com/forums/showpost.php?p=6893722&postcount=35. It's worth mentioning that if you can just pick up a few dice of Sneak Attack without sacrificing BAB, via Blackguard or a similar prestige class, then it's worth picking up a feats (like Craven and Staggering Strike) to supplement your Sneak Attack without a huge investment."
Also here's this handbook:
http://www.giantitp.com/forums/showthread.php?p=8711233which should help some.