The Lumber Bug cheat:
The lumber bug cheat works on both the PC and Mac versions of Warcraft II. Here's how it works.
1. Select one of your peons/peasants.
2. Tell him to mine some gold or lumber.
3. Immediately change his orders and tell him to build either a Town Hall or a Lumber Mill.
4. When the peon/peasant is finished your gold or lumber supplies will have increased by 100 of whatever you told them to mine in the first place, be it gold or lumber.
5. This cheat obviously doesn't work with oil because your oil tankers can't build structures.