Allright, this s my 2nd post, and this one is how to Not so Hard-Ly-ish find 
Mob Spawners.

There are 2 Ways for this!
-=1=-
Place a sand block above you, making it land on your feet, Line up with youself so
you can only JUST see the side of the block of sand, opposite the wall. Then place
another block of sand above you, then when you look horizontally, you will see 
through the sand, and everything in its path, you will be able to locate Mob 
Spawners this way because it is a Giant Black box with a smaller one in the middle.

-=2=-
when you think you are near a dungeon using the tip above, or by digging down, 
start hitting "F" as fast as you can, you will be able to see the flames of the 
Mob Spawner, Easy Findings!