Tank/Marine/Wraith Rush

This strategy was a great strategy that was used in the shareware days. This is meant for Terran vs Terran but it will also be effective vs Zerg.

1.Build scv and send each scv into its own patch.
2.Continue to build scvs until ur supplies are 8/10 then make a supplie depot when you have enough minerals.( Build the Supply Depot near a vespene guyser.)
3.Continue making scvs and when the supply depot is done use the scv(the one that made the depot) to make a refinery.
4.Continue making scvs and when your supplies are 12/18 you should soon have enough to make a barrack. When the Vespene Guyser is done send 1 scv to gather gas(making 2 mining gas).
5.When it is 14/18 create another Supply Depot when this is done send it to the refinery(making 3 gather gas) also send another scv to make another refinery and when done send another scv to mine gas in the new refinery.
6.Continue to make scvs and when the barrack is done you should have enough to build a factory. As soon as the factory is done make the add-on (research siege quickly first and when you have enough make a tank)and stop production of scvs for a while. Use the scv that made the factory to make a Starport and make an addon for it at 23/26 make a supply depot and make another starport.
7.(You should be making marines and scouting while u are building)Take 4-6 marines and 1 tank and attack their base using the marines to cover ur tank in siege mode.(Make sure you attack as soon as your first tank comes out.
8.While attacking research cloaking and make another supplie depot and 4 wraiths and as soon as this is done attack their drones/scvs/probes.

This makes it quite hard for the enemy to know what to do if he concentrates on covering the front u can attack by air killing his tanks with wraiths and if he covers his scvs he is open for attack in the front and while all this is happening u should have a lot of minerals giving you an advantage.

CreepColony's Opinion: If you throw in some vultures this strategy can be good against Protoss.