To get this working with multiple spawners in 1.2 follow this link
To see me design this in my LP follow this link
Slime farming playlist for sticky pistons
This tutorial will teach you how to setup a very effective XP Farm / EXP Farm using the cave spider spawners. You will learn how to link multiple spawners together and create a very productive farm.
Additional Info
Spider wont load into the iron bars? Give the first one a punch ;)
You may need to use splash potion for SMP
Become a mob cage expert
A special thanks to cubehamster for creating the redstone behind the crusher
