Tau are a delicate army that need some practice in my oppinion. They are often mistaken for a "sit back and shoot" army and/or their fire power is overrated. Don't be mistaken: Firepower is the Tau's one strength, but it needs to be used well to be successfull.

Starting Tau - how to put together your first Tau army.

Battlesuit Armament - a statistical analysis of battlesuit armament.

Death Rain Tactics - on the value and employment of Death Rain crisis suits.