G-Nome Cheats
Press Ctrl-F1 on the main screen to bring up a box in which you enter the following cheat codes. You'll hear a ding sound if you've entered the cheat code correctly. 
NOTE: these cheat codes are case-sensitive. 
Horny Elk Leer - allows maximum-range radar
Half Libel - allows you to teleport near the selected waypoint or target by pressing Ctrl-B
O'Sarge - Sarge in the training missions speaks with an Irish accent
Dunk It Here - plays outtakes from the recording sessions
A Scramble On - allows wallpaper capture using the standard Shift-Ctrl-right click