Techs:
Weapon Flipping Technique /Sword Catching Technique: QCB, Forward (Drops the opponents weapon if a strong slash is used.)
Rage Explosion: ABC (Expands your Sword Gauge)
Meditation: Hold the D button.
State of Nothingness: BCD when your health is below the arrow, so you use the Meditation Technique to waste less time. When you enter the State of Nothingness, you'll slow down time. And you can use the...
Fatal Flash: When you at the State of Nothingness, press BCD to use the powerful Fatal Flash! It is best when used near.
Wall Jump: You know how this works, Near a wall, then press the opposite direction.
Lower Crouch: Down,D
Roll: Diagonal Direction, D
Low Jump Forward: Forward, D
Low Jump: Back,D
Grab: Forward/Back,CD
Grab Attack: Grab + A/B
Low Jump Attack: Forward, BC
Down Attack: Diagonal Direction + A/B
Run: Forwardx2 (duh)
Low Jump Backwards: Backx2
Super: QCF + CD
Zetsumei Ougi : Enter Rage Explosion,QCB + CD (Works in Second Round, and your opponent needs to be at low health) In the Japanese Version, Samurai Spirits Zero Special, characters have special dialogue when they finish the opponent off with the move. But in the English Version, the dialogue depends on the players health.  
Taunt: Start, Start, Start. (You drop your weapon, AND you taunt your opponent. Just to be nice
Suicide: Back, Forward, Down-Forward, Down, Start. (To save a L.)
Clash: When you and your opponent slash at the same time, you go into a Clash, where you mash all of the buttons to win and drop your opponent's weapon (Or yours if you're not fast enough.)
Sword Gauge: Your power meter, the more, the better damage you'll conflict.
Weapon Pick Up: A/AB near your weapon.
Extra Note: When you enter DIE/KIL at the end of the game, your character dies.

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And besides that, this is covered by the "how to play" in the game...