After a while being crushed with my Tau in almost every game i think i have now realised how to actually use them properly. As ive mentioned before splitting them up is key IMO to winning the battle.
Last night i played against my mates Eldar force and in capture and control, i decided to stick most stuff off in one corner but to give it a wide frontage so as not to lose everything quickly. But i also stuck a nice juicy tatger out on the far right a good 20 odd inches away from the rest of my stuff, a Hammerhead a tetra and 2 suits.
The ploy worked quite nicely and he had to divert a serpent full of avengers, 2 Vypers and a Falcon with farseer and warlocks off to deal with them. In the end the suits bought the farm quickly but the hammerhead survived as did the tetra and did very well at splitting the enemy up. I like this plan of splitting, also using the tetra as mobile cover for my hammerhead when the enemy is within 12 inches is a new one ive found!