Press Enter and type: 

black sheep wall              Shows entire map 
breathe deep                  Free vespene gas
food for thought              Ability to build units beyond the supply limit
game over man                 Makes you lose (useful?)
medieval man                  Gives free upgrades to units
modify the phase variance     Ability to build any building regardless of 
                              requirements
noglues                       Enemy can't use magic 
operation cwal                Speeds up building and upgrading time
ophelia                       Type ophelia then press enter, then type 
                              in any mission name 
                              to warp
power overwhelming            God Mode
radio free zerg               Play secret Zerg song
show me the money             Gives you 10,000 mineral and gas points 
something for nothing         Gives all available upgrades
staying alive                 You will not be able to complete the mission 
                              you are on
the gathering                 Unlimited casting ability
there is no cow level         Completes the mission you are on
war aint what it used to be   Disables fog of war
whats mine is mine            Free minerals

Secret Level:
     Beat Zerg level 9 (The Reckoning) in under 20 minutesto open up a
secret  Protoss level. However, the mission itself won't appear on the
mission  select  screen for any side, so be sure and save at the start
of the
level to play it again.