Minecraft Water Trap

Elegant Drowning Trap From http://www.youtube.com/user/AkifHD?feature=watch

Via http://www.minecraftwiki.net/wiki/Tutorials/Monster_Spawner_traps#Flow_Trap

Found this while waiting for Dreamhack, I will have to try it out, have a Zombie spawner on a map that I set up as a quick simple grinder, had river near spawner and just dug out enough for river to push Zombies to one wall were I can hack at their legs.

This would make it a lot more efficient, and wouldn't take much work to add.