Oh emm gee guys! I just found an amazing superflat seed for 1.4.5! So here is the story:

I had the idea of maybe making a redstone based zombie hoard sort of thing, so I named the world "Zombies Maybe?" Then I went to where you put a seed and make it superflat. I made the map just a normal superflat kind of world and put in a random seed. It turned out to be awesome! You spawn on top of a villager's house! XD This is probably the coolest superflat seed I have EVER found. Here is the seed:

Seed: 215522444