FWIW, here is my current (haven't refined it just yet) "Ninja" build. And by "Ninja" I mean in theme, not in class name...
Human
Swordsage 13/Rogue 2/Warlock 2/Bloodclaw Master 3
Progression: Swordsage 1/Rogue 2/Warlock 2/SS +4/BCM 3/SS +8
Ability Scores
TBD
BAB +13/+8/+3
Fort +7
Ref +14
Will +12
Feats
(H) Adaptive Style
(1) Extra Readied Maneuver
(3) Two-Weapon Fighting
(6) Shadow Blade
(9) ???
(12) Gloom Razor (mainly for Shadow Slip)
(15) ITWF (+6 BAB)
(18) GTWF (+11 BAB)
Skills: Balance, Concentration, Hide, Jump, Martial Lore, Move Silently, Tumble
Weapon of Choice: Daggers (dual wielded)
Invocations
Leaps & Bounds
Spiderwalk
Class Abilities
Sneak Attack +1d6 (+4d6 w/ Assassin’s Stance)
Trap Finding
Evasion
Eldritch Blast +1d6 (think of a "ki blast" like Ken/Ryu from Street Fighter)
Detect Magic
Quick to Act +3
Discipline Focus (Weapon Focus) [Shadow Hand]
AC Bonus (Wis)
Discipline Focus (Insightful Strike) [Shadow Hand]
Sense Magic
Discipline Focus (Defensive Stance) [???]
Discipline Focus (Insightful Strike) [???]
Shifting 2/day
Claws of the Beast
Superior TWF
Tiger Claw synergy (stance)
Pouncing Strike
Low-light vision
Swordsage Initiator Level 18 (up to 9th level maneuvers)
Maneuvers/Stances
20 known /11 readied /4 stances
Maneuvers (® = Readied)
Sapphire Nightmare Blade (Strike) [DM 1]
Mighty Throw (Strike) [SS 1]
Sudden Leap (Boost) [TC 1]
® Cloak of Deception (Boost) [SH 2]
® Mind over Body (Counter) [DM 3]
Death Mark (Strike) [DW 3] (swap Distracting Embers)
Comet Throw (Strike) [SS 4]
Obscuring Shadow Veil (Strike) [SH 4] (swap Shadow Blade Technique)
Dancing Mongoose (Boost) [TC 5]
Pouncing Charge (Strike) [TC 5]
® Ballista Throw (Strike) [SS 6]
® Hydra Slaying Strike (Strike) [SS 7]
® Shadow Blink [SH 7] (swap out Shadow Jaunt)
® Bloodletting Strike (Strike) [SH 5]
® Enervating Shadow Strike (Strike) [SH 8]
® Raging Mongoose (Boost) [TC 8] (swap Wolf Fang Strike)
One with Shadow (Counter) [SH 8]
® Five-Shadow Creeping Ice Enervation Strike (Strike) [SH 9]
® Feral Death Blow (Strike) [TC 9] (swap Claw at the Moon)
® Tornado Strike (Strike) [SS 9]
Stances
Island of Blades
Child of Shadow
Assassin’s Stance
Step of the Dancing Moth