I named this build "The Janitor" because it straight sweeps everything up.  I am confident in saying this is the highest damage one can achieve with current PRC options, even higher than my previous Warcarnate build.  Like the Warcarnate, this build does this every single round, all day long.

What this build gives you: 17 pre-epic BAB; great attack bonus (Lolth's Meat and Epic Weapon Focus); absolutely crazy damage output - between soulmelds (Necrocarnum Weapon, Incarnate Avatar, Bluesteel Bracers), feats (Lolth's Meat, Cobalt Power, Weapon Specialization), Sweeping Strike (hit two enemies with every single swing!), and maneuvers (Pouncing Charge, Raging Mongoose, Time Stands Still, and Prey on the Weak) this character can average ~6000 melee damage a round (~8000 if you begin combat with a pounce) and ~2050 on a single pouncing charge***; the damage caused by this build is persistent and not constrained by abilities limited to times/day; immunity to nearly all status effects (Curst); the best saving throw boost there is (Diamond Defense); the ability to heal once per minute when recovering maneuvers (Vital Recovery); INT to reflex saves, crit confirmation, combat maneuvers, and damage against flat-footed enemies; the ability to instantly clear status effects (Ironheart Surge); uncanny dodge; some minor psionic manifesting abilities

Weakpoints: not the best AC (Curst helps with this) or base saves (though Lolth's Meat mitigates this short-coming after a few kills and Curst makes you immune to almost everything) - get equipment to boost AC and saves; you lose a small amount of damage output against non-living opponents (Necrocarnum Weapon), but the difference is small and won't slow you down

Build Name: The Janitor

Race: Half-Drow
Alignment: Neutral Evil
      
Strength 16
Dexterity 16
Constitution 12
Intelligence 8
Wisdom 14
Charisma 8
      
Lvl   Class
1   Incarnate 1: Lolth's Meat
2   IC2
3   IC3: Power Attack
4   IC4: 17 STR
5   IC5: Lore 8
6   IC6: Wild Talent
7   War Mind 1   
8   WM 2: 18 STR
9   WM 3: Undead Meldshaper, Curst Template (take Curst right before leveling up)
10   WM 4
11   WM 5
12   Warblade 1: Improved Critical (Scimitar), Maneuvers: Sudden Leap, Disarming Strike, Iron Heart Surge, Stance: Blood in the Water, 19 STR
13   WB 2: Maneuver: Saphire Nightmare Blade
14   WB 3: Maneuver: Emerald Razor
15   WB 4: Cobalt Power, Stance: Pearl of Black Doubt
16   WB 5: B: Vital Recovery, Maneuver: Pouncing Charge, 20 STR
17   WB 6
18   IC 7: Weapon Focus (Scimitar)
19   WB 7: Maneuvers: Avalanche of Blades
20   WB 8: 17 DEX
21   WB 9: Weapon Specialization (Scimitar), B: Iron Will, Maneuver: Raging Mongoose
22   WB 10: Stance: Prey on the Weak
23   WB 11: Maneuver: Time Stands Still
24   IC 8: Two-Weapon Fighting, 18 DEX
25   IC 9
26   IC 10
27   IC 11: Improved TWF
28   IC 12: 19 DEX
29   IC 13
30   IC 14: Greater TWF
31   IC 15
32   IC 16: 21 STR
33   IC 17: Cleave
34   IC 18
35   IC 19
36   IC 20: Great Cleave, 22 STR
37   IC 21
38   IC 22: B: Epic Weapon Focus (Scimitar)
39   WB 12: Epic Weapon Specialization (Scimitar)
40   WB 13: Maneuver: Diamond Defense, 20 DEX

Recommended Martial Maneuvers: Pouncing Charge, Raging Mongoose, Iron Heart Surge, Time Stands Still, Diamond Defense, Blood in the Water (Stance) for more damage or Prey on the Weak (Stance) for more attacks.  I think Prey on the Weak is the way to go.

Recommended Soul Melds: Necrocarnum Weapon, Incarnate Avatar, Bluesteel Bracers

Notes: you can buy off the level adjustment from Curst at 9, 15, and 18 - I recommend buying off at least one LA, but probably the other 2 as well if you are going to level 40.  As a general strategy, this build should begin combat by charging the strongest opponent, initiate raging mongoose as soon as possible, then initiate Time Stands Still, recover maneuvers, repeat.  Always make sure to recover your maneuvers immediately at/near the end of each combat - otherwise you will have to wait a full minute while they recover.

***Damage calculations updated after the scripted combat system was updated to pull in all the damage boosts.  They assume max level, enemies that are alive and not crit-immune and +20 damage from Lolth's Meat (which seems like a good average that I am doing in combat-heavy modules).