Minecraft mobs stop moving if the player is too far away, and mobs no longer walk off spawning pad edges voluntarily. This new mob spawner "Mobs On Demand (M.O.D.)" solves these problems by washing the mobs off the spawner pads into our mob trap or XP Farm... now we can have mobs on demand!

Currently Works in all versions: Minecraft 1.5 and beyond!

I show two designs, one with or without spiders. Enjoy!

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Texture Pack: (Customized) John Smith.
My 'How to edit your Minecraft texture pack' vid has the details/links: