Building Cheat Disc
To get the Building Cheat Disc that allows your to produce faster, play the first level of Zerg Brood Wars. After you save the first hive run over and save the second hive. After you save it go down and hiiden in a corner is the disc.
Faster building
Repeatedly press B on a structure to build it faster.
Fog of war off
On protoss level X03 begin the level and wait a while, some corsairs should fly in with some shuttles, they will pass a little island with a white flag. Get any unit to walk on the flag and your advisor informs you that you have located "the flag of knowledge" and you are granted the cheat.
To get anything but you have to pay
First press D, C, R and L and Z. This should result in a menu. This menu will show you ground units upgrades skills and special powers, and spells.
Unlimited mana
Complete all 56 missions in the episodes.
Unlimited money
Press C-Up, C-Left, C-Right then C-Down and you should have unlimited money.
Unlock all research
Episode 2, Zerg Mission 5, The Amerigo. Have Karrigan walk to the left of the cell with the animals in it.